Set the class attribute of the h3 element to "sale".

<html>
<head>
<link href="style.css" rel="stylesheet">
<style>
.sale {
color:red;
}
</style>
</head>
<body>
<h3 class="sale">SALE! 50% OFF!</h3>
</body>
</html>]]>

Make sure to add class="sale" to your code.