<html>
<head>
<style>
#grad1 {
height: 200px;
background-image: linear-gradient(to bottom right, red , blue);
}
</style>
</head>
<body>
<h1>Linear Gradient - Diagonal</h1>
<p>This linear gradient goes from top left to bottom right. It starts red, transitioning to blue:</p>
<div id="grad1"></div>
</body>
</html>