.embed-responsive {
  position: relative;
  display: block;
  width: 100%;
  padding-bottom: 20px;
  overflow: hidden;

  &::before {
	display: block;
	content: "";
  }

  .embed-responsive-item,
  iframe,
  embed,
  object,
  video {
	position: absolute;
	top: 0;
	bottom: 0;
	left: 0;
	width: 100%;
	height: 100%;
	border: 0;
  }
}

@each $embed-responsive-aspect-ratio in $embed-responsive-aspect-ratios {
  $embed-responsive-aspect-ratio-x: nth($embed-responsive-aspect-ratio, 1);
  $embed-responsive-aspect-ratio-y: nth($embed-responsive-aspect-ratio, 2);

  .embed-responsive-#{$embed-responsive-aspect-ratio-x}by#{$embed-responsive-aspect-ratio-y} {
	&::before {
	  padding-top: percentage($embed-responsive-aspect-ratio-y / $embed-responsive-aspect-ratio-x);
	}
  }
}