<div class="container">
  <div class="box backdrop-filter">
    <p>backdrop-filter: blur(10px)</p>
  </div>
</div>
.backdrop-filter {
  background-color: rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);  
  -webkit-backdrop-filter: blur(10px);
}

.box {
  padding: 20px 40px;
  border-radius: 5px;
  text-align: center;
  font-family: monospace;
  border: 1px solid rgba(0, 0, 0, 0.2);
}

body {
  background-image: url('https://xiaopc.org/logo.png');
  background-position: center;
  background-repeat: repeat-y;
  height: 500vh;
}

.container {
  align-items: center;
  position: fixed;
  display: flex;
  justify-content: center;
  height: 100%;
  width: 100%;
}

External CSS

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External JavaScript

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