Why are my div margins overlapping and how can I fix it?

Question

I don't understand why the margins of these divs are overlapping.

.alignright {float: right}
#header .social {margin-top: 50px;}
#header .social a {display: inline-block;}
#header .social .fb {width: 64px; height: 1px; padding-top: 60px; overflow: hidden;}
#header .social .twit {width: 64px; height: 1px; padding-top: 60px; overflow: hidden;}
#header .contact {margin: 20px 70px 20px 0; font-size: 14px; font-weight: bold;}
#header .contact span {color: #FFFFFF;}
#header .search {margin: 10px 0 0;}

<div class="alignright">
    <div class="social">
        <a href="#" class="twit"></a>
        <a href="#" class="fb"></a>
    </div><!-- social -->
    <div class="contact">
        Get in Touch: <span>[phone]</span>            
    </div><!-- contact -->
    <div class="search">
        <form method="post" action="">
            <input type="text" value="" name="s" gtbfieldid="28">
        </form>
    </div><!-- search -->
</div>

Jackshaft

You might find this article on formatting contexts interesting: tjkdesign.com/articles/… – Elburt

You seem to be missing some of the rules you're using there. Are all of the elements within .alignright also floated? – Priory

Answer 1

I think it's a collapsed margin. Only the largest margin between the bottom of the first element and the top of the second is taken into account.

It is quite normal to don't have too much space between two paragraphs eg.

You cannot avoid that with two adjacent elements so you have to enlarge or reduce the larger margin.

EDIT: cf. W3C

Two margins are adjoining if and only if:

• both belong to in-flow block-level boxes that participate in the same block formatting context
• no line boxes, no clearance, no padding and no border separate them
• both belong to vertically-adjacent box edges

So there is no collapsing with float which takes the element out of the flow.

Usable

Just lower your margin to what you want it to be. – Kitchens

Edited, just enlarge or reduce larger margin or use padding – Usable

just found out that if you float the elements then margins for both are applied. – Jackshaft

I would be wary of using float as a hack, as it can have some nasty side effects. I'm wary of using float as a rule. – Rata

If you give an hr a height does it become an in flow block level box? Try it – Roister

Answer 2

Margins, in contrary to padding (which pads a specific width) is a “do this as a minimum distance”.

It won’t put that distance to all elements.

As you can see, the get in touch block bottom margin is marged to the input box. That is the margin active here. The other margin, top margin from the input, is not in effect, as it’s smaller and does not reach a block-element where it would actually push back the element. The 2 margins overlap and don’t affect one another.

Kitchens

"minimum distance" that made it click for me – Hurried

Answer 3

Watch out for display: flex on the parent element.

.flex {
  display: flex;
  flex-direction: column;
}

.block {
  display: block;
}


/* css for example only */
div {
  padding: 1em;
  background: #eee;
}
p {
  font-size: 20px;
  margin: 1em 0;
  background: pink;
  padding: 5px;
}
p:first-child {
  margin-top: 0;
}

<h1>display: flex</h1>
<div class="flex">
  <p>Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Curabitur blandit tempus porttitor.</p>
  <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
  <p>Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Curabitur blandit tempus porttitor.</p>
  <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
</div>
<h1>display: block</h1>
<div class="block">
  <p>Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Curabitur blandit tempus porttitor.</p>
  <p>Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
  <p>Aenean eu leo quam. Pellentesque ornare sem lacinia quam venenatis vestibulum. Vivamus sagittis lacus vel augue laoreet rutrum faucibus dolor auctor. Curabitur blandit tempus porttitor. Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit.</p>
  <p>Fusce dapibus, tellus ac cursus commodo, tortor mauris condimentum nibh, ut fermentum massa justo sit amet risus.</p>
</div>

Incise

Answer 4

If you can not use padding and really need for margin not to overlap, here is one trick:

.btn {
    /* hack for a 2px margin */
    border-top: 2px #fff solid;
    /* this is important if you have a background-color
    and don't want to see it underneath the transparent border*/
    background-clip: padding-box;
}

Please launch this snippet for demo:

div {
  margin: 10px;
  background: rgb(48, 158, 140);
  padding: 5px 15px;
  font-weight: bold;
  color: #fff;
}

.fake-margin {
  border-top: 10px solid transparent;
  background-clip: padding-box;
}

<div>Margin applied is 10px on each sides</div>
<div>the first two have only 10px between them</div>
<div class="fake-margin">the last two have 10 + 10px</div>
<div class="fake-margin">= 20 px</div>

Bazan

Answer 5

Add a clear div tag between the two objects

Oscoumbrian