Aspect ratio css

aspect-ratio: 16 / 9;
// horizontal/vertical

Css media query aspect ratio

/* Minimum aspect ratio */
@media (min-aspect-ratio: 8/5) {
  div {
    background: #9af; /* blue */
  }
}

/* Maximum aspect ratio */
@media (max-aspect-ratio: 3/2) {
  div {
    background: #9ff;  /* cyan */
  }
}

/* Exact aspect ratio, put it at the bottom to avoid override*/
@media (aspect-ratio: 1/1) {
  div {
    background: #f9a; /* red */
  }
}

Source: developer.mozilla.org

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