The "margin-top" property of CSS child elements can impact the positioning of the parent element

Within the body of HTML 5 and with a specified doctype , I have the following code:

<div style="width:100%; background-color: #cccccc;">
    <div style="margin-top:20px; width:100px; background-color: #aa0000;">Sub</div>
    Main
</div>

http://jsfiddle.net/F3kXw/

When viewing in firefox, the outer div is rendered with a margin of 20px from the top of the page. However, I only want the sub div to have a 20px margin from the outer div. This can be achieved by placing text above the sub div as shown below:

<div style="width:100%; background-color: #cccccc;">
    Main
    <div style="margin-top:20px; width:100px; background-color: #aa0000;">Sub</div>
    Main
</div>

For reference: http://jsfiddle.net/F3kXw/2/

This issue is puzzling to me as it's something I haven't encountered before.

csshtml

Answer №1

Give this code a shot, it might provide some assistance

<div class="website_sub_frame" style="width:100%; background-color: #cccccc;overflow:hidden">

    <div style="clear:both; margin-top:20px; width:100px; background-color: #aa0000;">Sub</div>
    Main
</div>

Answer №2

Try a different approach by adding an additional div above your sub div with a specified height, instead of relying solely on margin top. For example:

Sub
Main

Answer №3

To improve the spacing of the child div, consider using margin-bottom instead of margin-top. Simple as that.

<div class="website_sub_frame" style="width:100%; background-color: #cccccc;">
    <div style="width:100px; background-color: #aa0000; margin-bottom:20px;">Sub</div>
    Main
</div>

Check out the live demonstration here.

Alternatively, if you prefer this layout:

<div class="website_sub_frame" style="width:100%; background-color: #cccccc;">
    Main
    <div style="width:100px; background-color: #aa0000; margin-top:20px;">Sub</div>
</div>

View the demo for this option here.

We hope this resolves your issue!

Answer №4

Try floating the parent DIV element. I'm not entirely sure why this solution is effective, but it seems to work.

<div style="float:left; width:100%; background-color: #cccccc;">
   <div style="margin-top:20px; width:100px; background-color: #aa0000;">Sub</div>
   Main
</div>

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