// Prefix declarations
@mixin prefixed($property, $value) {
    -webkit-#{$property}: unquote($value);
            #{$property}: unquote($value);
}

@mixin aspect-ratio($width, $height) {
  position: relative;
  height: auto;

  &:before {
    /* Make an element a certain aspect ratio */
    display: block;
    content: "";
    width: 100%;
    padding-top: ($height / $width) * 100%;
  }

  .seq-screen {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
  }
}