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<!DOCTYPE html>
<html>
<head>
<style>
div {
  background-color: #4CAF50;
  padding: 10px;
}
div.first {
  opacity: 0.1;
}
div.second {
  opacity: 0.3;
}
div.third {
  opacity: 0.6;
}
</style>
</head>
<body>
<h1>The opacity Property</h1>
<p>The opacity property adds transparency to the background of an element, and to all of its child elements as well. This makes the text inside a transparent element hard to read:</p>
<div class="first"><p>opacity 0.1</p></div>
<div class="second"><p>opacity 0.3</p></div>
<div class="third"><p>opacity 0.6</p></div>
<div><p>opacity 1 (default)</p></div>
</body>
</html>