<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
h2 {
border-bottom-style: solid;
}
div {
border-bottom-style: dashed;
}
</style>
</head>
<body>
<h2>A heading with a solid bottom border</h2>
<div>A div element with a dashed bottom border.</div>
</body>
</html>