@media

Applies styles only when certain conditions are met, such as specific screen widths, resolutions, or user preferences like dark mode.

It is documented as part of the CSS Conditional Rules specification.

/* Usage Example */
@media only screen and (max-width: 600px) {
body{
    background-color: lightblue;
  }
}
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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