code is as follows:  


<! PUBLIC DOCTYPE HTML "-///DTD/W3C XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >
<HTML XMLNS="http://www.w3.org/1999/xhtml" XML: lang="en" >
<Head>
<Meta HTTP - equiv="content-type" Content="text/HTML; charset=utf-8"/>
<Title> Mask - layer
</head>
<Style type="text/CSS" >
* {margin: 0; Padding: 0; }
ul {100 px margin: 0 auto; Width: 200 px; }
img {border: 0 none; }
li {background - color: # 555; The list - style: none; Width: 146 px; Height: 220 px; }
a: hover {opacity: 0.6; }
</style>
<Body>
<Ul>
<Li> <A href="" ><Img SRC="http://h.hiphotos.baidu.com/baike/s%3D220/sign=700b0c26462309f7e36faa10420f0c39/64380cd7912397dd9e0581b65982b2b7d0a28707.jpg" Alt=""/></a> </li>
</ul>
</body>
</html>

principle# 0 - #


This concludes the body part