:where(html) {
  --ratio-square: 1;
  --ratio-landscape: 4/3;
  --ratio-portrait: 3/4;
  --ratio-widescreen: 16/9;
  --ratio-ultrawide: 18/5;
  --ratio-golden: 1.6180/1;
}

.responsive-img {
  max-width: 100%;
  height: auto;
  display: block;
}