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