Issue with margin-bottom behaving incorrectly in responsive layout

There's a strange issue I've encountered with using margin-bottom in a CSS class for responsive design. Take a look at this example:

HTML

<div class="space-bottom">
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque commodo sollicitudin molestie. In lacus purus, posuere non lacus eu, pharetra suscipit arcu.</p>
</div>

CSS

.space-bottom {margin-bottom: 10px;}

The class "space-bottom" with a margin bottom of 10px doesn't seem to work on mobile devices, even when inserted into a Media Query, which is quite perplexing. However, if I change the "class" to an "id" like this:

HTML

<div id="space-bottom">
<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Pellentesque commodo sollicitudin molestie. In lacus purus, posuere non lacus eu, pharetra suscipit arcu.</p>
</div>

CSS

#space-bottom {margin-bottom: 10px;}

Surprisingly, it seems to work just fine without needing to be placed within a Media Query.

htmlcssresponsive-design

Answer №1

The CSS in the initial example is not causing any problem; what you might be observing is the collapsing margins for the <p> element and the <div>, due to the default margins set by the browser for the <p>.

For more details on collapsing margins, refer to Mozilla Developer Network's page on this concept.

Moreover, the CSS in the second instance is incorrect; it should be targeting a <space-bottom> element with the id of id. I am puzzled as to why it appears to be working, or working to some extent.

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