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<!DOCTYPE html>
<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>