Controlling Stacking Order of Pseudo-Elements in CSS
The stacking order of ::before and ::after pseudo-elements is controlled using CSS z-index in combination with the position property. By default, ::before is rendered behind the content of the element, and ::after is rendered in front. You can change this behavior by specifying z-index values.
Pseudo-elements participate in the CSS stacking context like regular child elements.
To use
z-index, the pseudo-element must havepositionset torelative,absolute, orfixed.Higher
z-indexvalues appear above lower ones within the same stacking context.Default order without
z-index:::beforebehind content, element content in the middle,::afteron top.
In this example, the blue ::after pseudo-element appears above the red ::before pseudo-element because it has a higher z-index. Adjusting z-index lets you layer pseudo-elements relative to the element's content and each other.
Always set
positionbefore applyingz-indexto pseudo-elements.Use
z-indexto control visual stacking, especially for decorative overlays or layered effects.Be mindful of stacking contexts created by parent elements, as they affect how
z-indexvalues interact.Test across browsers to ensure consistent rendering of layered pseudo-elements.