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css: margin does not work

Once in a while when two elements with the following criteria

• has only content (no padding and no border)
• has vertical margins applied to it

When they touch each other the margin collapse to the larger of the two margins. In the below example, we have two boxes which satisfies the above criteria.

• Both the boxes have 20px vertical margins. They should have 40px margins between them.
• Due to the vertical margin collapse, they have only 20px margin between them as shown in the below pen.

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[codepen_embed height="268" theme_id="0" slug_hash="obqwEq" default_tab="result" user="kavitshah8"]See the Pen vertical-margin-collapse-1 by Kavit Shah (@kavitshah8) on CodePen.[/codepen_embed]

There are multiple solutions to solve this problem.

• You can apply border to one of the element
• You can apply padding to one of the element

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Also Read:

1. querySelector vs getElementById
2. position:absolute
3. gzip compress and cache api response in express
4. center using css
5. A simple requestAnimationFrame example visually explained

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