Vertically aligning CSS :before and :after content [duplicate]

Question

I am trying to centre the link with the image, but can't seem to move the content vertically in any way.

<h4>More Information</h4>
<a href="#" class="pdf">File Name</a>

The icon is 22 x 22px

.pdf {
    font-size: 12px;
}
.pdf:before {
    padding:0 5px 0 0;
    content: url(../img/icon/pdf_small.png);
}
.pdf:after {
    content: " ( .pdf )";
    font-size: 10px;
}
.pdf:hover:after {
    color: #000;
}

Tertiary

Consider using flex: https://mcmap.net/q/40457/-how-do-i-vertically-center-text-with-css-duplicate - the answer is for text but works on all elements. – Gentlefolk

Thanks to CSS3's substring matching attribute selectors, you can now do a[href$=".pdf"] { … } and not even need the class. – Baring

This seems to be the best answer for vertically centering content of :before/:after pseudo-elements: https://mcmap.net/q/161339/-vertically-centering-content-of-before-after-pseudo-elements – Lattonia

Answer 1

Answered my own question after reading your advice on the vertical-align CSS attribute. Thanks for the tip!

.pdf:before {
    padding: 0 5px 0 0;
    content: url(../img/icon/pdf_small.png);
    vertical-align: -50%;
}

Tertiary

Nice. What worked for me was vertical-align:super; – Myrwyn

This vertical-align in % with negative values is awesome. Don't know before. – Both

Answer 2

You can also use tables to accomplish this, like:

.pdf {
  display: table;
}
.pdf:before {
  display: table-cell;
  vertical-align: middle;
}

Here is an example: https://jsfiddle.net/ar9fadd0/2/

EDIT: You can also use flex to accomplish this:

.pdf {
  display: flex;
}
.pdf:before {
  display: flex;
  align-items: center;
}

Here is an example: https://jsfiddle.net/ctqk0xq1/1/

Infeasible

neither of these fiddles work on Chrome 52 – Luben

both of them work for me on Chrome Version 52.0.2743.116 (64-bit) (Linux) – Infeasible

neither works on OSX. imgur.com/bqUQ09X – Luben

the question was about vertically aligning :before and :after elements and thats what the fiddles do, also in your screenshot – Infeasible

"I am trying to centre the link with the image" that isn't done in either example or my screenshot – Luben

Works as a charm nowadays. Used for a tiny icon that indicates a master-detail row in a table and aligns perfectly in the middle dynamically (resizing the window makes the <tr> element larger and smaller and the icon stays vertically centered (chrome)) – Eileneeilis

Answer 3

I'm no CSS expert, but what happens if you put vertical-align: middle; into your .pdf:before directive?

Binns

Awesome, middle did not work so I had to use a negative percentage instead, thanks for the heads up! – Tertiary

Glad to help. Did "middle" do nothing, or something-but-not-what-you-wanted? – Binns

Answer 4

I think a cleaner approach is to inherit the vertical alignment:

In html:

<div class="shortcut"><a href="#">Download</a></div>

And in css:

.shortcut {
    vertical-align: middle;
}
.shortcut > a:after {
    vertical-align: inherit;
{

This way the icon will align properly in any resolution/font-size combination. Great for use with icon fonts.

Interviewer

Perfect. Simple and elegant – Solicitude

Answer 5

Using flexboxes did the trick for me:

.pdf:before {
    display: flex;
    align-items: center;
    justify-content: center;
}

Futurism

Answer 6

This is what worked for me:

.pdf::before {
    content: url('path/to/image.png');
    display: flex;
    align-items: center;
    justify-content: center;
    height: inherit;
}

Karolynkaron

Answer 7

Messing around with the line-height attribute should do the trick. I haven't tested this, so the exact value may not be right, but start with 1.5em, and tweak it in 0.1 increments until it lines up.

.pdf{ line-height:1.5em; }

Tori

that should do the trick for text-content! – Dimpledimwit

Answer 8

I spent a good amount of time trying to work this out today, and couldn't get things working using line-height or vertical-align. The easiest solution I was able to find was to set the <a/> to be relatively positioned so it would contain absolutes, and the :after to be positioned absolutely taking it out of the flow.

a{
    position:relative;
    padding-right:18px;
}
a:after{
    position:absolute;
    content:url(image.png);
}

The after image seemed to automatically center in that case, at least under Firefox/Chrome. Such may be a bit sloppier for browsers not supporting :after, due to the excess spacing on the <a/>.

Horsepowerhour

Answer 9

I just found a pretty neat solution, I think. The trick is to set the line-height of image (or any content) height.

text

Using CSS:

div{
  line-height: 26px; /* height of the image in #submit span:after */
}

span:after{
    content: url('images/forward.png');
    vertical-align: bottom;
}

That would probably also work without the span.

Muscovite

Answer 10

I had a similar problem. Here is what I did. Since the element I was trying to center vertically had height = 60px, I managed to center it vertically using:

top: calc(50% - 30px);

Goggle