<html>
<head>
<style>
#grad1 {
height: 200px;
background-color: #cccccc;
background-image: radial-gradient(red, yellow);
}
</style>
</head>
<body>
<h2>Radial Gradient as Background Image</h2>
<p>This radial gradient starts in the center. It starts red, transitioning to yellow:</p>
<div id="grad1"></div>
</body>
</html>