<main>
  <h1>Hello, World</h1>
  <img src="http://place-puppy.com/600x400" alt="">
</main>
h1 {
  position: absolute;
  top: 0;
  left: 0;
  border: 2px dashed;
  padding: 1em;
  backdrop-filter: blur(10px);
  color: white;
  font-family: monospace;
  font-weight: 100;
}

External CSS

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External JavaScript

This Pen doesn't use any external JavaScript resources.