Why is My Last Margin or Padding Collapsing in Flexbox/Grid Layout?

Last Margin / Padding Collapsing in Flexbox / Grid Layout

Flexbox and grid layout are powerful tools for arranging UI elements. However, they can lead to unexpected behavior, such as the collapsing of the last margin or padding.

Potential Problem #1: Overflow

In a flexbox or grid layout, the overflow property does not apply to margins or padding. This means that if a child element has a margin or padding applied, it will not collapse with the neighboring element's margin or padding.

To resolve this issue, ensure that the overflow property is not set to hidden. If it is necessary to hide the overflow, use the "overflow-x" or "overflow-y" properties instead.

Potential Problem #2: CSS Box Model

The CSS Box Model dictates that the overflow property only applies to the content box area. Margins and paddings lie outside this area and are not affected by the overflow property.

If margins or paddings are collapsing unexpectedly, check that there is no overflow within the content box. If there is overflow, set the overflow property to hidden on the child element.

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