* {
font-family:'微软雅黑',Arial, Helvetica, sans-serif;
font-size:14px;
padding:0px;
margin:0px;
}

#header {
background:#DDD;
padding:10px 20px;
border-bottom:2px solid #CCC;
}

h1 {
font-size:22px;
}

h2 {
font-size:18px;
border-bottom:1px solid #DDD;
margin:10px 0;
}

h3 {
font-size:14px;
margin:10px 0;
padding-left:2px;
border-left:2px solid #666666;
}

ul {
margin-left:20px;
}

.main {
margin:20px;
}

.code {
border:1px solid #CCC;
background:#EEE;
padding:5px;
font-size:12px;
font-family:Verdana, Arial;
color:#333333;
}

.main{width: 500px; margin: 200px auto}
.main select{margin-left: 50px;width: 130px; }