@mixin embed-responsive---alter() {
}

@mixin embed-responsive() {
  position: relative;
  display: block;
  width: 100%;
  padding: 0;
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center center;
  &::before {
    content: "";
    display: block;
    width: 100%;
  }
  @include embed-responsive---alter;
}

@mixin embed-responsive--ratio---alter($ratio) {
}

@mixin embed-responsive--ratio($ratio: percentage(9/16)) {
  &::before {
    padding: $ratio 0 0 0;
  }
  @include embed-responsive--ratio---alter($ratio);
}

@mixin embed-responsive__item---alter() {
}

@mixin embed-responsive__item() {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
  @include embed-responsive__item---alter;
}