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<!DOCTYPE html>
<html>
<head>
<style>
h1 {
  border-style: solid;
  border-width: 15px;
}
div {
  border-style: solid;
  border-width: 15px;
}
</style>
</head>
<body>
<h1>A heading with a 15px thick border</h1>
<div>A div element with a 15px thick border.</div>
<p><strong>Note:</strong> The border-width property does not work if it is used alone. Use the border-style property to set the border first.</p>
</body>
</html>