<!-- Learn about backdrop-filter on MDN: https://developer.mozilla.org/en-US/docs/Web/CSS/backdrop-filter -->

<div class="container">
  <div class="boxes">
    <p>Scroll → </p>
    <div class="box none">
      <h1>backdrop-filter: none</h1>
    </div>
    <div class="box grayscale">
      <h1>backdrop-filter: grayscale(1)</h1>
    </div>
    <div class="box brightness">
      <h1>backdrop-filter: brightness(1.5)</h1>
    </div>
    <div class="box blur">
      <h1>backdrop-filter: blur(5px)</h1>
    </div>
    <div class="box contrast">
      <h1>backdrop-filter: contrast(.8)</h1>
    </div>
    <div class="box invert">
      <h1>backdrop-filter: invert(.7)</h1>
    </div>
    <div class="box opacity">
      <h1>backdrop-filter: opacity(.4)</h1>
    </div>
    <div class="box sepia">
      <h1>backdrop-filter: sepia(.4)</h1>
    </div>
    <div class="box saturate">
      <h1>backdrop-filter: saturate(1.8)</h1>
    </div>
    <div class="box hue-rotate">
      <h1>backdrop-filter: hue-rotate(120deg)</h1>
    </div>
  </div>
</div>

* { box-sizing: border-box; }

html,
body {
  width: 100%;
  margin: 0;
}

body {
  background-color: black;
  display: flex;
  justify-content: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

.container {
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/14179/0236.jpg');
  background-size: cover;
  height: 100vh;
  padding: 10px;
  width: 100%;
  position: relative;
  iframe {
    position: absolute;
    top:0; right: 0; left: 0; bottom:0;
    width: 100%;
    height: 100%;
    object-fit: cover;
  }
}

.boxes {
  display: flex;
  margin-right: 10px;
  overflow: scroll;
  min-height: 90vh;
  width: 100%;
  align-items: center;
  
  p {
    display: block;
    font-weight: 600;
    min-width: 200px;
    color: white;
    font-size: 40px;
    @media (min-width:767px) {
      font-size: 60px;
      min-width: 300px;
    }
  }
}

.box {
  border: 1px solid rgba(255,255,255,.7);
  min-width: 400px;
  min-height: 95vh;
  line-height: 1; 
  padding: 15px 15px;
  transition: all .3s ease;
  
  &:nth-child(1n + 1) {
    border-right: none;
  }
  
  h1 {
    font-weight: 400;
    font-size: 18px;
  }
}

.none {
  backdrop-filter: none;
}

.grayscale {
  backdrop-filter: grayscale(1);  
}
.brightness {
  backdrop-filter: brightness(1.5);  
}
.blur {
  backdrop-filter: blur(5px);  
}
.contrast {
  backdrop-filter: contrast(.8);  
}
.drop-shadow {
  backdrop-filter: drop-shadow(4px 4px 10px blue);  
}
.invert {
  backdrop-filter: invert(.7);
}
.opacity {
  backdrop-filter: opacity(.4);
}
.sepia {
  backdrop-filter: sepia(.4);
}
.saturate {
  backdrop-filter: saturate(1.8);
}
.hue-rotate {
  backdrop-filter: hue-rotate(120deg);
}