if NOT html5,
<style type="text/css">
link a outside style:
<link> tag
<link rel="stylesheet" href="css/style.css" >
HTML 4.01:
<link rel="stylesheet" href="css/style.css" type="text/css" />
@import
<style>
@import url(css/style.css);
@import url(css/style2.css);
</style>
