级联样式表（Cascading Style Sheet）简称“CSS”，通常又称为“风格样式表（Style Sheet）”
<html>
<head>
<style>
A {color:red;}
P {background-color: blue;color:white}
</style>
</head>
<body>
<a href= 'file:///C:/Users/00146476/Desktop/test/test.html'>testLink</a>
<p>Notice Backgroud Color</p>
</body>
</style>
</html>
===================================与上面等效=====================================
<html>
<head>
<link href="test.css" type="text/css" rel="stylesheet"/>
<!-- <style>
A {color:red;}
P {background-color: blue;color:white}
</style> -->
</head>
<body>
<a href= 'file:///C:/Users/00146476/Desktop/test/test.html'>testLink</a>
<p>Notice Backgroud Color</p>
</body>
</style>
</html>
-----------------------------test.css文件--------------------------------
<style>
A {color:red;}
P {background-color: blue;color:white}
</style>
在线手册： http://css.doyoe.com/