Cut Corners using CSS

Asked 6/9, 2011 at 18:56 Answered 17/1, 2021 at 9:25

I'm looking to "cut" the top left corner of a div, like if you had folded the corner of a page down.

I'd like to do it in pure CSS, are there any methods?

Karylkarylin answered 6/9, 2011 at 18:56 Comment(0)

125

If the parent element has a solid color background, you can use pseudo-elements to create the effect:

div {
    height: 300px;
    background: red;
    position: relative;
}

div:before {
    content: '';
    position: absolute;
    top: 0; right: 0;
    border-top: 80px solid white;
    border-left: 80px solid red;
    width: 0;
}

<div></div>

http://jsfiddle.net/2bZAW/

P.S. The upcoming border-corner-shape is exactly what you're looking for. Too bad it might get cut out of the spec, and never make it into any browsers in the wild :(

Desuetude answered 6/9, 2011 at 19:5 Comment(6)

I don't understand why this works. Before is used to prepend content to an element. What is causing the diagonal effect? – Heptamerous 6/6, 2014 at 22:46

@Heptamerous - :before adds a pseudo element that can be styled independently of the main element. The pseudo element here is styled with a border, which creates the white triangle (when an element's borders meet, they're cut diagonally. – Desuetude 6/6, 2014 at 23:9

This is cool, but I believe I'm right in saying it only works when the background colour behind the parent element is white? – Emeliaemelin 27/4, 2016 at 15:16

@Emeliaemelin Or a predictable, solid color. – Mooneyham 10/4, 2018 at 19:26

There are/would be? work arounds for that issue though, one being to cut off overflow. – Halftruth 17/5, 2018 at 5:44

I have tried and a background with "transparent" may also be set to the pseudo element if you need the element's color to be seen. – Calc 12/3, 2020 at 15:57

CSS Clip-Path

Using a clip-path is a new, up and coming alternative. Its starting to get supported more and more and is now becoming well documented. Since it uses SVG to create the shape, it is responsive straight out of the box.

div {
  width: 200px;
  min-height: 200px;
  -webkit-clip-path: polygon(0 0, 0 100%, 100% 100%, 100% 25%, 75% 0);
  clip-path: polygon(0 0, 0 100%, 100% 100%, 100% 25%, 75% 0);
  background: lightblue;
}

<div>
  <p>Some Text</p>
</div>

CSS Transform

I have an alternative to web-tiki's transform answer.

body {
  background: lightgreen;
}
div {
  width: 200px;
  height: 200px;
  background: transparent;
  position: relative;
  overflow: hidden;
}
div.bg {
  width: 200%;
  height: 200%;
  background: lightblue;
  position: absolute;
  top: 0;
  left: -75%;
  transform-origin: 50% 50%;
  transform: rotate(45deg);
  z-index: -1;
}

<div>
  <div class="bg"></div>
  <p>Some Text</p>
</div>

Adriatic answered 13/10, 2015 at 10:56 Comment(1)

That's nice but looks weird when the div is not square – Thetisa 30/7, 2023 at 21:54

If you need a transparent cut out edge, you can use a rotated pseudo element as a background for the div and position it to cut out the desired corner:

Transprent cut out edge on a div

body {
  background: url(http://i.imgur.com/k8BtMvj.jpg);
  background-size: cover;
}
div {
  position: relative;
  width: 50%;
  margin: 0 auto;
  overflow: hidden;
  padding: 20px;
  text-align: center;
}
div:after {
  content: '';
  position: absolute;
  width: 1100%; height: 1100%;
  top: 20px; right: -500%;
  background: rgba(255,255,255,.8);
  transform-origin: 54% 0;
  transform: rotate(45deg);
  z-index: -1;
}

<div>
  ... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>
</div>

Note that this solution uses transforms and you need to add the required vendor prefixes. For more info see canIuse.

To cut the bottom right edge, you can change the top, transform and transform-origin properties of the pseudo element to:

body {
  background: url(http://i.imgur.com/k8BtMvj.jpg);
  background-size: cover;
}
div {
  position: relative;
  width: 50%;
  margin: 0 auto;
  overflow: hidden;
  padding: 20px;
  text-align: center;
}
div:after {
  content: '';
  position: absolute;
  width: 1100%; height: 1100%;
  bottom: 20px; right: -500%;
  background: rgba(255,255,255,.8);
  transform-origin: 54% 100%;
  transform: rotate(-45deg);
  z-index: -1;
}

<div>
  ... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>... content ...<br/>
</div>

Hierolatry answered 7/10, 2014 at 17:0 Comment(6)

Just if someone looking for 2 cuted corners solution: jsfiddle.net/o2udwet4 for previous/next buttons – Electrode 19/6, 2015 at 13:50

It would be nice if someone explained why this works. Something to do with the draw order of pseudo elements? – Delinquent 6/8, 2015 at 9:24

@AdamThomas The background is applied to the :after pseudo-element, which extends beyond the parent div, and is rotated in such a way to not cover the top corner. Because the parent div specifies overflow: hidden, the parts of the :after pseudo-element which extend beyond it aren't visible. – Bennettbenni 30/1, 2016 at 19:55

I'd like to know why the width and height are specifically set to 1100%, why the right property is set to -500% – Emeliaemelin 27/4, 2016 at 15:28

@Emeliaemelin the width and height are set to a very high value so that the pseudo element overflows the container even when it is bigger than in the example. The -500% value for the right property on the pseudo element is to horizontaly center it in the container (1100% -100%) / 2 = 500% – Hierolatry 27/4, 2016 at 15:35

How would I amend this to cut the bottom left corner? – Orellana 1/8, 2018 at 19:44

Here is another approach using CSS transform: skew(45deg) to produce the cut corner effect. The shape itself involves three elements (1 real and 2 pseudo-elements) as follows:

The main container div element has overflow: hidden and produces the left border.
The :before pseudo-element which is 20% the height of the parent container and has a skew transform applied to it. This element prodcues the border on the top and cut (slanted) border on the right side.
The :after pseudo-element which is 80% the height of the parent (basically, remaining height) and produces the bottom border, the remaining portion of the right border.

The output produced is responsive, produces a transparent cut at the top and supports transparent backgrounds.

div {
  position: relative;
  height: 100px;
  width: 200px;
  border-left: 2px solid beige;
  overflow: hidden;
}
div:after,
div:before {
  position: absolute;
  content: '';
  width: calc(100% - 2px);
  left: 0px;
  z-index: -1;
}
div:before {
  height: 20%;
  top: 0px;
  border: 2px solid beige;
  border-width: 2px 3px 0px 0px;
  transform: skew(45deg);
  transform-origin: right bottom;
}
div:after {
  height: calc(80% - 4px);
  bottom: 0px;
  border: 2px solid beige;
  border-width: 0px 2px 2px 0px;
}
.filled:before, .filled:after {
  background-color: beige;
}

/* Just for demo */

div {
  float: left;
  color: beige;
  padding: 10px;
  transition: all 1s;
  margin: 10px;
}
div:hover {
  height: 200px;
  width: 300px;
}
div.filled{
  color: black;
}
body{
 background-image: radial-gradient(circle, #3F9CBA 0%, #153346 100%);
}

<div class="cut-corner">Some content</div>
<div class="cut-corner filled">Some content</div>

The below is another method to produce the cut corner effect by using linear-gradient background images. A combination of 3 gradient images (given below) is used:

One linear gradient (angled towards bottom left) to produce the cut corner effect. This gradient has a fixed 25px x 25px size.
One linear gradient to provide a solid color to the left of the triangle that causes the cut effect. A gradient is used even though it produces a solid color because we can control size, position of background only when images or gradients are used. This gradient is positioned at -25px on X-axis (basically meaning it would end before the place where the cut is present).
Another gradient similar to the above which again produces a solid color but is positioned at 25px down on the Y-axis (again to leave out the cut area).

The output produced is responsive, produces transparent cut and doesn't require any extra elements (real or pseudo). The drawback is that this approach would work only when the background (fill) is a solid color and it is very difficult to produce borders (but still possible as seen in the snippet).

.cut-corner {
  height: 100px;
  width: 200px;
  background-image: linear-gradient(to bottom left, transparent 50%, beige 50%), linear-gradient(beige, beige), linear-gradient(beige, beige);
  background-size: 25px 25px, 100% 100%, 100% 100%;
  background-position: 100% 0%, -25px 0%, 100% 25px;
  background-repeat: no-repeat;
}
.filled {
  background-image: linear-gradient(black, black), linear-gradient(black, black), linear-gradient(black, black), linear-gradient(black, black), linear-gradient(to bottom left, transparent calc(50% - 1px), black calc(50% - 1px), black calc(50% + 1px), beige calc(50% + 1px)), linear-gradient(beige, beige), linear-gradient(beige, beige);
  background-size: 2px 100%, 2px 100%, 100% 2px, 100% 2px, 25px 25px, 100% 100%, 100% 100%;
  background-position: 0% 0%, 100% 25px, -25px 0%, 0px 100%, 100% 0%, -25px 0%, 100% 25px;
}

/* Just for demo */

*{
  box-sizing: border-box;
  }
div {
  float: left;
  color: black;
  padding: 10px;
  transition: all 1s;
  margin: 10px;
}
div:hover {
  height: 200px;
  width: 300px;
}
body{
 background-image: radial-gradient(circle, #3F9CBA 0%, #153346 100%);
}

<div class="cut-corner">Some content</div>
<div class="cut-corner filled">Some content</div>

Uncertainty answered 14/10, 2015 at 9:55 Comment(0)

I have an online generator for some of the below code: https://css-generators.com/custom-corners/

You can use mask and CSS variables to have better control over the whole shape. It's responsive, transparent and allow any kind of background:

.box {
  --all:0px;
  width:200px;
  height:150px;
  display:inline-block;
  margin:10px;
  background:red;
  -webkit-mask:
     linear-gradient(  45deg, transparent 0 var(--bottom-left,var(--all)) ,#fff 0) bottom left,
     linear-gradient( -45deg, transparent 0 var(--bottom-right,var(--all)),#fff 0) bottom right,
     linear-gradient( 135deg, transparent 0 var(--top-left,var(--all))    ,#fff 0) top left,
     linear-gradient(-135deg, transparent 0 var(--top-right,var(--all))   ,#fff 0) top right;
   -webkit-mask-size:50.5% 50.5%;
   -webkit-mask-repeat:no-repeat;
}


body {
  background:grey;
}

<div class="box" style="--top-left:20px"></div>
<div class="box" style="--top-right:20px;--bottom-right:50px;background:radial-gradient(red,yellow)"></div>
<div class="box" style="--all:30px;background:url(https://picsum.photos/id/104/200/200)"></div>
<div class="box" style="--all:30px;--bottom-right:0px;background:linear-gradient(red,blue)"></div>
<div class="box" style="--all:50%;width:150px;background:green"></div>
<div class="box" style="--all:12%;width:150px;background:repeating-linear-gradient(45deg,#000 0 10px,#fff 0 20px)"></div>

And below in case you want to consider border:

.box {
  --all:0px;
  --b:pink;
  
  width:200px;
  height:150px;
  display:inline-block;
  margin:10px;
  border:5px solid var(--b);
  background:
     linear-gradient(  45deg, var(--b) 0 calc(var(--bottom-left,var(--all)) + 5px) ,transparent 0) bottom left /50% 50%,
     linear-gradient( -45deg, var(--b) 0 calc(var(--bottom-right,var(--all)) + 5px),transparent 0) bottom right/50% 50%,
     linear-gradient( 135deg, var(--b) 0 calc(var(--top-left,var(--all)) + 5px)    ,transparent 0) top left    /50% 50%,
     linear-gradient(-135deg, var(--b) 0 calc(var(--top-right,var(--all)) + 5px)   ,transparent 0) top right   /50% 50%,
     var(--img,red);
  background-origin:border-box;
  background-repeat:no-repeat;
  -webkit-mask:
     linear-gradient(  45deg, transparent 0 var(--bottom-left,var(--all)) ,#fff 0) bottom left,
     linear-gradient( -45deg, transparent 0 var(--bottom-right,var(--all)),#fff 0) bottom right,
     linear-gradient( 135deg, transparent 0 var(--top-left,var(--all))    ,#fff 0) top left,
     linear-gradient(-135deg, transparent 0 var(--top-right,var(--all))   ,#fff 0) top right;
   -webkit-mask-size:50.5% 50.5%;
   -webkit-mask-repeat:no-repeat;
}


body {
  background:grey;
}

<div class="box" style="--top-left:20px"></div>
<div class="box" style="--top-right:20px;--bottom-right:50px;--img:radial-gradient(red,yellow);--b:white;"></div>
<div class="box" style="--all:30px;--img:url(https://picsum.photos/id/104/200/200) center/cover;--b:orange;"></div>
<div class="box" style="--all:30px;--bottom-right:0px;--img:linear-gradient(red,blue)"></div>
<div class="box" style="--all:50%;width:150px;--img:green;--b:red;"></div>
<div class="box" style="--all:12%;width:150px;--img:repeating-linear-gradient(45deg,#000 0 10px,#fff 0 20px)"></div>

Let's also add some radius:

.box {
  --all:0px;
  --b:pink;
  
  width:200px;
  height:150px;
  display:inline-block;
  margin:10px;
  filter:url(#round);
}
.box::before {
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  bottom:0;
  background:var(--img,red);
  -webkit-mask:
     linear-gradient(  45deg, transparent 0 var(--bottom-left,var(--all)) ,#fff 0) bottom left,
     linear-gradient( -45deg, transparent 0 var(--bottom-right,var(--all)),#fff 0) bottom right,
     linear-gradient( 135deg, transparent 0 var(--top-left,var(--all))    ,#fff 0) top left,
     linear-gradient(-135deg, transparent 0 var(--top-right,var(--all))   ,#fff 0) top right;
   -webkit-mask-size:50.5% 50.5%;
   -webkit-mask-repeat:no-repeat;
}

body {
  background:grey;
}

<div class="box" style="--top-left:20px"></div>
<div class="box" style="--top-right:20px;--bottom-right:50px;--img:radial-gradient(red,yellow);--b:white;"></div>
<div class="box" style="--all:30px;--img:url(https://picsum.photos/id/104/200/200) center/cover;--b:orange;"></div>
<div class="box" style="--all:30px;--bottom-right:0px;--img:linear-gradient(red,blue)"></div>
<div class="box" style="--all:50%;width:150px;--img:green;--b:red;"></div>
<div class="box" style="--all:12%;width:150px;--img:repeating-linear-gradient(45deg,#000 0 10px,#fff 0 20px)"></div>

<svg style="visibility: hidden; position: absolute;" width="0" height="0" xmlns="http://www.w3.org/2000/svg" version="1.1">
  <defs>
        <filter id="round">
            <feGaussianBlur in="SourceGraphic" stdDeviation="5" result="blur" />    
            <feColorMatrix in="blur" mode="matrix" values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 19 -9" result="goo" />
            <feComposite in="SourceGraphic" in2="goo" operator="atop"/>
        </filter>
    </defs>
</svg>

Louella answered 17/1, 2021 at 9:25 Comment(0)

You could use linear-gradient. Let's say the parent div had a background image, and you needed a div to sit on top of that with a gray background and a dog-eared left corner. You could do something like this:

.parent-div { background: url('/image.jpg'); }
.child-div { 
   background: #333;
   background: linear-gradient(135deg, transparent 30px, #333 0);
}

See it on CodePen

Further reading:

Woodworth answered 29/7, 2014 at 19:6 Comment(1)

Sadly, doesn't look so nice in certain angles. – Vincent 30/10, 2014 at 8:14

This code allows you to cut corners on each side of the rectangle:

div {
  display:block;
  height: 300px;
  width: 200px;
  background: url('http://lorempixel.com/180/290/') no-repeat;
  background-size:cover;

  -webkit-clip-path: polygon(10px 0%, calc(100% - 10px) 0%, 100% 10px, 100% calc(100% - 10px), calc(100% - 10px) 100%, 10px 100%, 0% calc(100% - 10px), 0% 10px);
  clip-path: polygon(10px 0%, calc(100% - 10px) 0%, 100% 10px, 100% calc(100% - 10px), calc(100% - 10px) 100%, 10px 100%, 0% calc(100% - 10px), 0% 10px);
}

http://jsfiddle.net/2bZAW/5552/

Finedrawn answered 18/6, 2016 at 10:14 Comment(4)

Is it possible to achieve while having a border somehow? – Cowherb 27/8, 2017 at 19:26

Thanks. Do you know how this solution affects performance? It seems a little heavy. – Cowherb 18/9, 2017 at 13:5

@Cowherb It needs more investigation – Finedrawn 16/3, 2018 at 13:12

This is old, but the clip path works great. I found a handy tool to build the clip paths for you as well: bennettfeely.com/clippy – Enochenol 29/11, 2020 at 3:27

If you need a diagonal border instead of a diagonal corner, you can stack 2 divs with each a pseudo element:

DEMO

http://codepen.io/remcokalf/pen/BNxLMJ

.container {
  padding: 100px 200px;
  overflow: hidden;
}

div.diagonal {
  background: #da1d00;
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
  width: 300px;
  height: 300px;
  padding: 70px;
  position: relative;
  margin: 30px;
  float: left;
}

div.diagonal2 {
  background: #da1d00;
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
  width: 300px;
  height: 300px;
  padding: 70px;
  position: relative;
  margin: 30px;
  background: #da1d00 url(http://www.remcokalf.nl/background.jpg) left top;
  background-size: cover;
  float: left;
}

div.diagonal3 {
  background: #da1d00;
  color: #da1d00;
  font-family: Arial, Helvetica, sans-serif;
  width: 432px;
  height: 432px;
  padding: 4px;
  position: relative;
  margin: 30px;
  float: left;
}

div.inside {
  background: #fff;
  color: #da1d00;
  font-family: Arial, Helvetica, sans-serif;
  width: 292px;
  height: 292px;
  padding: 70px;
  position: relative;
}

div.diagonal:before,
div.diagonal2:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  border-top: 80px solid #fff;
  border-right: 80px solid transparent;
  width: 0;
}

div.diagonal3:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  border-top: 80px solid #da1d00;
  border-right: 80px solid transparent;
  width: 0;
  z-index: 1;
}

div.inside:before {
  content: '';
  position: absolute;
  top: -4px;
  left: -4px;
  border-top: 74px solid #fff;
  border-right: 74px solid transparent;
  width: 0;
  z-index: 2;
}

h2 {
  font-size: 30px;
  line-height: 1.3em;
  margin-bottom: 1em;
  position: relative;
  z-index: 1000;
}

p {
  font-size: 16px;
  line-height: 1.6em;
  margin-bottom: 1.8em;
}

#grey {
  width: 100%;
  height: 400px;
  background: #ccc;
  position: relative;
  margin-top: 100px;
}

#grey:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  border-top: 80px solid #fff;
  border-right: 80px solid #ccc;
  width: 400px;
}

<div id="grey"></div>
<div class="container">
  <div class="diagonal">
    <h2>Header title</h2>
    <p>Yes a CSS diagonal corner is possible</p>
  </div>
  <div class="diagonal2">
    <h2>Header title</h2>
    <p>Yes a CSS diagonal corner with background image is possible</p>
  </div>
  <div class="diagonal3">
    <div class="inside">
      <h2>Header title</h2>
      <p>Yes a CSS diagonal border is even possible with an extra div</p>
    </div>
  </div>
</div>

Telly answered 9/7, 2015 at 14:52 Comment(0)

We had the problem of different background colors for our cutted elements. And we only wanted upper right und bottom left corner.

body {
 background-color: rgba(0,0,0,0.3)
 
}

.box {
 position: relative;
 display: block;
 background: blue;
 text-align: center;
 color: white;
 padding: 15px;
 margin: 50px;
}

.box:before,
.box:after {
 content: "";
 position: absolute;
 left: 0; 
 right: 0;
 bottom: 100%;
 border-bottom: 15px solid blue;
 border-left: 15px solid transparent;
 border-right: 15px solid transparent;
}

.box:before{
	border-left: 15px solid blue;
}

.box:after{
	border-right: 15px solid blue;
}

.box:after {
 bottom: auto;
 top: 100%;
 border-bottom: none;
 border-top: 15px solid blue;
}


/* Active box */
.box.active{
	background: white;
	color: black;
}



.active:before,
.active:after {
 border-bottom: 15px solid white;
}

.active:before{
	border-left: 15px solid white;
}

.active:after{
	border-right: 15px solid white;
}

.active:after {
 border-bottom: none;
 border-top: 15px solid white;
}

<div class="box">
 Some text goes here. Some text goes here. Some text goes here. Some text goes here.<br/>Some text goes here.<br/>Some text goes here.<br/>Some text goes here.<br/>Some text goes here.<br/>Some text goes here.<br/>
</div>
<div class="box">
 Some text goes here.
</div>
<div class="box active">
 Some text goes here.
 <span class="border-bottom"></span>
</div>
<div class="box">
 Some text goes here.
</div>

Gass answered 9/3, 2018 at 11:2 Comment(0)

According to Harry's linear-gradient solution (answered Oct 14 '15 at 9:55), it says that opacity background isn't possible, I tried it and yep, it isn't.

But! I found a workaround. No it's not super optimised, but it worked. So here's my solution. Since Harry doesn't use pseudo element, we can achieve this by creating one.

Set position relative to the container and create a pseudo element with the same linear-gradient properties. In other words, just clone it. Then put a transparent background for the container, and lets say a black background for the clone. Put a position absolute on it, a z-index of -1 and an opacity value (ie. 50%). It will do the job. Again it's a workaround and it's not perfect but it works just fine.

.cut-corner {
    position: relative;
    color: white;
    background-repeat: no-repeat;
    background-image: linear-gradient(white, white), linear-gradient(white, white), linear-gradient(white, white), linear-gradient(white, white), linear-gradient(to bottom left, transparent calc(50% - 1px), white calc(50% - 1px), white calc(50% + 1px), transparent calc(50% + 1px)), linear-gradient(transparent, transparent), linear-gradient(transparent, transparent);
    background-size: 2px 100%, 2px 100%, 100% 2px, 100% 2px, 25px 25px, 100% 100%, 100% 100%;
    background-position: 0% 0%, 100% 25px, -25px 0%, 0px 100%, 100% 0%, -25px 0%, 100% 25px;
}
.cut-corner:after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    right: 0;
    top: 0;
    z-index: -1;
    opacity: 0.5;
    background-repeat: no-repeat;
    background-image: linear-gradient(white, white), linear-gradient(white, white), linear-gradient(white, white), linear-gradient(white, white), linear-gradient(to bottom left, transparent calc(50% - 1px), white calc(50% - 1px), white calc(50% + 1px), black calc(50% + 1px)), linear-gradient(black, black), linear-gradient(black, black);
    background-size: 2px 100%, 2px 100%, 100% 2px, 100% 2px, 25px 25px, 100% 100%, 100% 100%;
    background-position: 0% 0%, 100% 25px, -25px 0%, 0px 100%, 100% 0%, -25px 0%, 100% 25px;
}

/* Just for demo */

div {
  padding: 10px;
}
body{
 background-image: radial-gradient(circle, #3F9CBA 0%, #153346 100%);
}

<div class="cut-corner">
  Some content<br>
  Some content<br>
  Some content<br>
  Some content  
</div>

Marrufo answered 26/4, 2017 at 3:40 Comment(0)

You can use clip-path, as Stewartside and Sviatoslav Oleksiv mentioned. To make things easy, I created a sass mixin:

@mixin cut-corners ($left-top, $right-top: 0px, $right-bottom: 0px, $left-bottom: 0px) {
  clip-path: polygon($left-top 0%, calc(100% - #{$right-top}) 0%, 100% $right-top, 100% calc(100% - #{$right-bottom}), calc(100% - #{$right-bottom}) 100%, $left-bottom 100%, 0% calc(100% - #{$left-bottom}), 0% $left-top);
}

.cut-corners {
  @include cut-corners(10px, 0, 25px, 50px);
}

Fortson answered 23/5, 2020 at 20:13 Comment(2)

This question is tagged 'CSS'. – Connection 25/2, 2021 at 22:7

@Connection it may be helpful to others though – Fortson 12/3, 2021 at 20:22

With a small edit to Joseph's code, the element does not require a solid background:

div {
    height: 300px;
    background: url('http://images2.layoutsparks.com/1/190037/serene-nature-scenery-blue.jpg');
    position: relative;
}

div:before {
    content: '';
    position: absolute;
    top: 0; right: 0;
    border-top: 80px solid white;
    border-left: 80px solid rgba(0,0,0,0);
    width: 0;
}

http://jsfiddle.net/2bZAW/1921/

This use of 'rgba(0,0,0,0)' allows the inner 'corner' to be invisible .

You can also edit the 4th parameter 'a', where 0 < a < 1, to have a shadow for more of a 'folded-corner' effect:

http://jsfiddle.net/2bZAW/1922/ (with shadow)

NOTE: RGBA color values are supported in IE9+, Firefox 3+, Chrome, Safari, and in Opera 10+.

Stinko answered 11/1, 2014 at 14:52 Comment(2)

use the word 'transparent' instead of rgba(0,0,0,0) and you'll get greater support in IE7+ – Variorum 19/2, 2014 at 10:57

The parent element however still has to be a solid color (e.g. in your example it is solid white), which I think was the limitation Joseph was referring to. @web-tiki's answer handles more complex backgrounds fantastically. – Whit 19/4, 2015 at 7:26

by small modification of Joshep's code...You can use this code which seems like right corner folded down as per your requirement.

div {
    height: 300px;
    background: red;
    position: relative;
}

div:before {
    content: '';
    position: absolute;
    top: 0; right: 0;
    border-top: 80px solid white;
    border-left: 80px solid blue;
    width: 0;
}

Lm answered 21/3, 2014 at 7:32 Comment(0)

Another one solution: html:

<div class="background">
  <div class="container">Hello world!</div>
</div>

css:

.background {
  position: relative;
  width: 50px;
  height: 50px;
  border-right: 150px solid lightgreen;
  border-bottom: 150px solid lightgreen;
  border-radius: 10px;
}
.background::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border: 25px solid lightgreen;
  border-top-color: transparent;
  border-left-color: transparent;
}
.container {
  position: absolute;
  padding-left: 25px;
  padding-top: 25px;
  font-size: 38px;
  font-weight: bolder;
}

https://codepen.io/eggofevil/pen/KYaMjV

Bybee answered 9/4, 2019 at 13:12 Comment(0)

I recently cut off the top right corner and overlaid the tabs like folders. Complete code noob, so ignore the shitty code, but I did this by combining a square, a triangle, and a rectangle... This may or may not be a new approach, but hopefully, someone finds it helpful.

https://i.sstatic.net/qFMRz.png

Here is the HTML:

<!DOCTYPE html>
<html lang ="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1">
        <link rel="stylesheet" type="text/css" href="style.css"> 
    </head>
    <body>
        <div class="folders">
            <div class="container">
                <div class="triangleOne">
                    <p class="folderNames">Home</p>
                </div>
                <div class="triangleOneCut">
                </div>
                <div class="triangleOneFill">
                </div>
            </div>

            <div class="container2">
                <div class="triangleOne blue">
                    <p class="folderNames">About</p>
                </div>
                <div class="triangleOneCut blueCut">
                </div>
                <div class="triangleOneFill blue">
                </div>
            </div>

            <div class="container3">
                <div class="triangleOne green">
                    <p class="folderNames">Contact</p>
                </div>
                <div class="triangleOneCut greenCut">
                </div>
                <div class="triangleOneFill green">
                </div>
            </div>
        </div>
    </body>
</html>

Here is the CSS:

.triangleOne {
    height: 50px;
    width: 40px;
    background: red;
    border-radius: 5px 0px 0px 5px;
    position: absolute;
}

.triangleOneCut {
    content: '';
    position: absolute;
    top: 0; left: 40px;
    border-top: 10px solid transparent;
    border-left: 10px solid red;
    width: 0;
}

.triangleOneFill {
    content: '';
    position: absolute;
    top: 10px; left: 40px;
    width: 10px;
    height: 40px;
    background-color: red;
    border-radius: 0px 0px 5px 0px;
}

.container {
    position: relative;
    height: 50px;
    width: 50px;
    display: inline-block;
    z-index: 3;
}

.container2 {
    position: relative;
    height: 50px;
    width: 50px;
    display: inline-block;
    left: -10px;
    z-index: 2;
}

.container3 {
    position: relative;
    height: 50px;
    width: 50px;
    display: inline-block;
    left: -20px;
    z-index: 1;
}

.blue {
    background-color: blue;
}

.green {
    background-color: green;
}

.blueCut {
    border-left: 10px solid blue;
}

.greenCut {
    border-left: 10px solid green;
}

.folders {
    width: 160px;
    height: 50px;
    /* border: 10px solid white; */
    margin: auto;
    padding-left: 25px;
    margin-top: 100px;
}

.folderNames {
    text-align: right;
    padding-left: 2px;
    color: white;
    margin-top: 1.5px;
    font-family: monospace;
    font-size: 6.5px;
    border-bottom: double 1.5px white;
}

Marja answered 26/8, 2017 at 5:2 Comment(0)

Here's a solution for if you don't want a solid-color background, i.e. just a border with square-cut corners.

.container {
  width: 100px;
  height: 100px;
  background-color: white;
  border: 1px solid black;
  position: relative;
}

.border {
      position: absolute;
      width: 100%;
      height: 100%;
}
.border:before {
        content: '';
        position: absolute;
        border-top: 15px solid white;
        border-left: 15px solid white;
        width: 0;
      }
  
.border:after {
        content: '';
        position: absolute;
        width: 16px;
        height: 1px;
        background: black;
      }
 
.tl:before { top: -5px; left: -5px; transform: rotate(-45deg); }
.tl:after { top: 5px; left: -3px; transform: rotate(-45deg);}

.tr:before { top: -5px; right: -5px; transform: rotate(45deg); }
.tr:after { top: 5px; right: -3px; transform: rotate(45deg); }

.bl:before { bottom: -5px; left: -5px; transform: rotate(45deg); }
.bl:after { bottom: 5px; left: -3px; transform: rotate(45deg); }

.br:before { bottom: -5px; right: -5px; transform: rotate(-45deg); }
.br:after { bottom: 5px; right: -3px; transform: rotate(-45deg); }

<html>
  <body>
     <div class="container">
       <div class="border tl"></div>
       <div class="border tr"></div>
       <div class="border bl"></div>
       <div class="border br"></div>
     </div>
  </body>
</html>

Beadledom answered 15/9, 2020 at 21:39 Comment(0)

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