.w {
    width: 1200px;
    margin: 0 auto;
}
.banner {
    background: url(banner.png) no-repeat center;
    height: 454px;
    width: 100%;
}
.con {
    height: 622px;
    background-color: #e6eef1;
    width: 100%;
}
.cont_main {
    background-color: white;
    width: 1200px;
    height: 622px;
}
.cont_ul {
    padding-left: 70px;
    padding-right: 70px;
    padding-top: 40px;
}
.cont_ul li {
    float: left;
    width: 245px;
    height: 240px;
    box-shadow: 5px 5px 10px rgba(150, 150, 150, 0.5);
}
.cont_ul li:nth-child(2) {
    margin-left: 160px;
    margin-right: 160px;
}
.cont_ul2 {
    clear: both;
    margin-top: 45px;
    padding-left: 70px;
    padding-right: 70px;
    padding-top: 40px;
}
.cont_ul2 li {
    float: left;
    width: 245px;
    height: 240px;
    box-shadow: 5px 5px 10px rgba(150, 150, 150, 0.5);
}
.cont_ul2 li:nth-child(2) {
    margin-left: 160px;
    margin-right: 160px;
}