@mixin vs-at-breakpoint($key) {
  $screens: (
    xs: xs 0 575px,
    sm: sm 576px 767px,
    md: md 768px 991px,
    lg: lg 992px 1199px,
    xl: xl 1200px
  );

  $viewport: map-get($screens, $key);

  @if length($viewport) == 2 {
    @media all and (min-width: nth($viewport, 2)) {
      @content;
    }
  } @else {
    @media all and (min-width: nth($viewport, 2)) and (max-width: nth($viewport, 3)) {
      @content;
    }
  }
}