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<!DOCTYPE html>
<html>
<head>
<style>
img.background {
  width: 100%;
  height: 100%;
  position: absolute;
  left: 0px;
  top: 0px;
  z-index: -1;
  filter: blur(35px);
}
</style>
</head>
<body>
<h1>The blur() Function</h1>
<p>Blurred background:</p>
<img class="background" src="pineapple.jpg" alt="Pineapple" width="300" height="300">
</body>
</html>