HTML Before and Afters

index.html

<div class="comparators">
  <div class="comparison">
    <figure
      style="
        background-image: url(https://s3.amazonaws.com/cdn.monarchy.io/clients/nu-dentistry/before-after/b4a-1a.jpg);
      "
    >
      <div
        style="
          background-image: url(https://s3.amazonaws.com/cdn.monarchy.io/clients/nu-dentistry/before-after/b4a-1b.jpg);
        "
        id="divisor-1"
      ></div>
    </figure>
    <input
      type="range"
      min="0"
      max="100"
      value="50"
      id="slider-1"
      oninput="moveDivisor1()"
    />
  </div>
  <div class="comparison">
    <figure
      style="
        background-image: url(https://s3.amazonaws.com/cdn.monarchy.io/clients/nu-dentistry/before-after/b4a-2a.jpg);
      "
    >
      <div
        id="divisor-2"
        style="
          background-image: url(https://s3.amazonaws.com/cdn.monarchy.io/clients/nu-dentistry/before-after/b4a-2b.jpg);
        "
      ></div>
    </figure>
    <input
      type="range"
      min="0"
      max="100"
      value="50"
      id="slider-2"
      oninput="moveDivisor2()"
    />
  </div>
  <div class="comparison">
    <figure
      style="
        background-image: url(https://s3.amazonaws.com/cdn.monarchy.io/clients/nu-dentistry/before-after/b4a-3a.jpg);
      "
    >
      <div
        id="divisor-3"
        style="
          background-image: url(https://s3.amazonaws.com/cdn.monarchy.io/clients/nu-dentistry/before-after/b4a-3b.jpg);
        "
      ></div>
    </figure>
    <input
      type="range"
      min="0"
      max="100"
      value="50"
      id="slider-3"
      oninput="moveDivisor3()"
    />
  </div>
</div>
<style>
  .comparators {
    display: flex;
    gap: 2rem;
    width: 1200px;
  }

  .comparison {
    width: 60vw;
    max-width: 600px;
    max-height: 600px;
    overflow: hidden;
    aspect-ratio: 1 / 1;
  }
  .comparison figure {
    /*background-image: url(https://s3.amazonaws.com/cdn.monarchy.io/clients/nu-dentistry/before-after/b4a-1a.jpg);*/
    background-size: cover;
    position: relative;
    font-size: 0;
    width: 100%;
    height: 100%;
    margin: 0;
  }
  .comparison figure > img {
    position: relative;
    width: 100%;
  }
  .comparison figure div {
    /*background-image: url(https://s3.amazonaws.com/cdn.monarchy.io/clients/nu-dentistry/before-after/b4a-1b.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: 20px;
    height: 15px;
    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);
  }
</style>
<script>
  const divisor1 = document.getElementById("divisor-1");
  const slider1 = document.getElementById("slider-1");
  const divisor2 = document.getElementById("divisor-2");
  const slider2 = document.getElementById("slider-2");
  const divisor3 = document.getElementById("divisor-3");
  const slider3 = document.getElementById("slider-3");

  function moveDivisor1() {
    divisor1.style.width = slider1.value + "%";
  }
  function moveDivisor2() {
    divisor2.style.width = slider2.value + "%";
  }
  function moveDivisor3() {
    divisor3.style.width = slider3.value + "%";
  }
</script>