// Credit: Nicolas Gallagher and SUIT CSS. .ratio { position: relative; width: 100%; &::before { display: block; padding-top: var(--#{$variable-prefix}aspect-ratio); content: ""; } > * { position: absolute; top: 0; left: 0; width: 100%; height: 100%; } } @each $key, $ratio in $aspect-ratios { .ratio-#{$key} { --#{$variable-prefix}aspect-ratio: #{$ratio}; } }