<!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>