.contain{
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    overflow-x: hidden;
    overflow-y: auto;
    min-width: 1000px;
}
.top_bg{
    width: 1920px;
    height: 339px;
    margin-left: -960px;
    position: absolute;
    left: 50%;
    top: 0;
    background: url("../../images/contain_bg.png") no-repeat center top;
    z-index: -1;
}
.inner_main{
    width: 1000px;
    margin: 0 auto;
    position: relative;
}
.banner{
    height: 214px;
    background: url("../../images/logo.png") no-repeat left 55px;
}
.nav{
    width: 100%;
    overflow: hidden;
}
.nav li{
    width: 33.3%;
    height: 54px;
    line-height: 54px;
    float: left;
    box-sizing: border-box;
    border: 1px solid #d7d7d7;
    font-size: 18px;
    color: #333;
    text-align: center;
    background: #fff;
    cursor: pointer;
}
.nav li.active,.nav li:hover{
    color: #fff;
    background: #0878d6;
}
.content{
    margin: 0 20px;
}
.footer{
    background: #1167b0;
    text-align: center;
    font-size: 14px;
    color: #fff;
}
.footer ul{
    display: inline-block;
    margin: 30px 0;
}
.footer li{
    line-height: 2em;
}
.footer span{
    margin: 0 10px;
}