div#comparison {
  width: 600vw;
  height: 338vw;
  max-width: 1200px;
  max-height: 675px;
  overflow: hidden;
}

div#comparison figure {
  background-image: url(https://bygarcias.com/images/img-original.jpg);
  background-size: cover;
  position: relative;
  font-size: 0;
  width: 100%;
  height: 100%;
  margin: 0;
}

div#comparison figure > img {
  position: relative;
  width: 100%;
}

div#comparison figure div {
  background-image: url(https://bygarcias.com/images/img-modified.jpg);
  background-size: cover;
  position: absolute;
  width: 50%;
  box-shadow: 0 5px 10px -2px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  bottom: 0;
  height: 100%;
}

input[type="range"] {
  -webkit-appearance: none;
  -moz-appearance: none;
  position: relative;
  top: -2rem;
  left: -2%;
  background-color: rgba(255, 255, 255, 0.1);
  width: 102%;
}

input[type="range"]:focus {
  outline: none;
}

input[type="range"]:active {
  outline: none;
}

input[type="range"]::-moz-range-track {
  -moz-appearance: none;
  height: 15px;
  width: 98%;
  background-color: rgba(255, 255, 255, 0.1);
  position: relative;
  outline: none;
}

input[type="range"]::active {
  border: none;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px;
  height: 15px;
  background: #fff;
  border-radius: 0;
}

input[type="range"]::-moz-range-thumb {
  -moz-appearance: none;
  width: 600px;
  height: 338px;
  background: #fff;
  border-radius: 0;
}

input[type="range"]:focus::-webkit-slider-thumb {
  background: rgba(255, 255, 255, 0.5);
}

input[type="range"]:focus::-moz-range-thumb {
  background: rgba(255, 255, 255, 0.5);
}