.banner{
    width: 100%;
    background: url(../images/banner.png) no-repeat center top;
    height: 493px;
    position: relative;
}
.header{
    width: 1200px;
    height: 100px;
    position: absolute;
    top:0;
    left:50%;
    margin-left: -600px;
}
.logo{
    width: 216px;
    height: 65px;
    margin-top: 17px;
    float: left;
}
.nav{
    height: 100%;
    float: right;
}
.nav li{
    font-size: 18px;
    width: 80px;
    height: 100px;
    padding: 0 20px;
    line-height: 100px;
    float: left;
    text-align: center;
}
.nav li a{
    display: block;
    color: #FFFFFF;
}
.top{
    width: 100%;
    height: 50px;
    background: url(../images/top.png) no-repeat center;
}

.content{
    width: 100%;
}
.content_in{
    width: 1200px;
    height:auto;
    margin: 0 auto;
    position: relative;
}
.context{
    padding: 120px 103px;
}
.footer{
    width: 100%;
    font-size: 12px;
    height: 50px;
    line-height: 50px;
    background: url(../images/footer.png) no-repeat center;
    text-align: center;
    color: #FFFFFF;
}