<html>
<head>
<style>
h1 {
border-bottom: 5px solid red;
}
h2 {
border-bottom: 4px dotted blue;
}
div {
border-bottom: double;
}
</style>
</head>
<body>
<h1>A heading with a solid red bottom border</h1>
<h2>A heading with a dotted blue bottom border</h2>
<div>A div element with a double bottom border.</div>
</body>
</html>