box-shadow

Adds shadow effects around an element's frame. It can be used to create depth, elevation, or subtle glows.

It is documented as part of the CSS Backgrounds and Borders specification.

/* Usage Example */
.card {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  /* x-offset y-offset blur spread color */
}

/* Syntax */
box-shadow: none;

/* Global values */
box-shadow: inherit;
box-shadow: initial;
box-shadow: revert;
box-shadow: revert-layer;
box-shadow: unset;
Widely available Since 2015 96% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.

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