How to Stretch a Flex Child to Fill the Container Height Without Using `height: 100%`?

Understanding How to Stretch Flex Child to Fill Container Height

While working with Flexbox, you might encounter a common issue where you need to stretch the yellow child element to fill the entire height of the blue parent element. However, if you naively set the height of the parent to 100%, you may face unexpected results.

The key to solving this problem lies in avoiding the incorrect use of height: 100% on both the child and parent elements. Flexbox operates differently from traditional layouts, and relying heavily on absolute height values can disrupt its natural behavior.

The Solution: Remove Height Constraints

To stretch the yellow child to the full height of the blue parent, simply remove the height: 100% declaration from both elements. This allows Flexbox to automatically manage the vertical spacing based on its default settings.

In Flexbox, items are aligned vertically according to the align-items property. By default, this property is set to stretch, which instructs Flexbox to distribute the available height proportionally among child elements. Therefore, removing the height constraint allows Flexbox to fill the yellow child to the full height of the parent, respecting the height of the blue child text.

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