Explanation
To specify the default style sheet type used in a page, specify Content-Style-Type for http-equiv and style sheet type for content. In Cascading Style Sheet, specify text/css.
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=shift_jis">
<meta http-equiv="Content-Style-Type" content="text/css">
<title>Sample</title>
</head>
<body>
<h1>Sample</h1>
<p>Indicate the default style sheet.</p>
</body>
</html>