#*{margin: 0px; padding: 0px;}

.clear{clear: both;}

li {list-style: none;}

a{text-decoration: none; font-size: 15px; margin-left: 5px; color: #fff; line -height: 40px; display: inline-block;

padding-left: 10px;padding-right: 10px; position: relative; }

.header

{ background -color: #105599}

.headermain

{width: 1200px;margin: 0px auto; height: 40px;}

.headermain_l

{ float: left;}

.headermain_r

{

width: 550px;

float: right;

}

.headermain_r a:hover

{

background-color: #0A2743;

}

.headermain_r ul

{

height: 80px; width: 80px; position: absolute;

}

.headermain_r ul li

{

height: 30px;

}

Which teacher can help analyze it