Display flex align items center5/13/2023 Based on what we’ve discussed above, we can set the z-index property of its flex items, even if they aren’t positioned elements (i.e. It contains two child elements - boxes with numbers “2” and “3”. Specifically, it has position: fixed and covers the entire viewport. front element itself is absolutely positioned. front element has one child, a box with a number “1”. See the Pen Flexbox and z-index by SitePoint ( on CodePen. To understand this behavior, consider the following example: The CSS Flexible Box Layout spec says:įlex items paint exactly the same as inline blocks, except that order-modified document order is used in place of raw document order, and z-index values other than auto create a stacking context even if position is static. However, an “unpositioned” element, such as a flex item can also receive the z-index property. An element is “positioned” when its position property is set to relative, absolute, fixed, or sticky. By default, all elements have position: static and aren’t positioned. As you probably already know, the z-index property works only on positioned elements.
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