Why Does the Last Margin or Padding Collapse in Flexbox and Grid Layouts?

Last Margin / Padding Collapsing in Flexbox / Grid Layout

In flexbox and grid layout, you may encounter an issue where the last item's right margin or padding collapses, seemingly disappearing. This can be frustrating if you want to maintain consistent spacing between all items.

Potential Problem #1: Overflow Overflow

Despite the spec claiming otherwise, it appears that the overflow property in flexbox and grid layout may not be limited to the content box area. In these contexts, it may extend to the margins and paddings. Therefore, if the width of the container is not sufficient to accommodate all the items and their margins, the overflow will trigger and the last margin will be ignored.

Solution:

Ensure that the container has sufficient width to accommodate the items and their margins. Avoid setting the container's overflow property to auto or hidden, as this can potentially cut off the last margin. Instead, consider using scroll if necessary.

Potential Problem #2: Inline Block Elements

Outside of a flex or grid formatting context, in a standard block layout, the last margin may also collapse for inline block elements. This can occur regardless of the overflow property.

Solution:

If you encounter this issue with inline block elements, you can consider using flexbox or grid layout to create a formatting context where the margins will be properly respected. Alternatively, you can use JavaScript to manually adjust the margins of the last element.

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