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<!DOCTYPE html>
<html>
<head>
<style>
body {
  background-color:#E7E9EB;
}
#myDIV {
  height:300px;
  background-color:#FFFFFF;
}
#div2 {
  border: 1px solid black;
  background-color: yellow;
  width: 200px;
  height: 100px;
  position: relative;
  top: 80px;
  left: 20px;
  padding: 20px;
}
#div1 {
  border: 1px solid black;
  position: relative;
  left: 50px;
  padding: 20px;
  background-color: lightblue;
  width: 200px;
  height: 100px;
  opacity: 0.4;
}
</style>
</head>
<body>
<h1>The opacity property</h1>
<div id="myDIV">
  <div id="div2">A yellow DIV element.</div>
  <div id="div1">Change the opacity of the blue DIV.</div>
</div>
</body>
</html>