*{padding:0;margin:0;  }
.header{
    width:100%;
    height:90px;
}
.header_top{
    width:100%;
    height:90px;
    background: rgba(255, 255, 255, 0.8);
}
.header_top img{
    margin:30px 20px 0 20px;
    float:left;
    cursor: pointer;
}
.header_top p{
    height:90px;
    color:#525252;
    font-size:36px;
    text-align:center;
    float:left;
    line-height:90px;
}
.nav{
    width:278px;
    height:347px;
    background:url("../image/nav_bg.png") no-repeat;
    position: absolute;
    left:15px;
    padding-top:40px;
   display:none;
    z-index:9999999;
}
.nav li{
    width:100%;
    height:72px;
    line-height:72px;
    list-style: none;
    font-size:32px;
    text-align: center;
}
.nav li a{
    color:#666;
    text-decoration: none;
}