.container{
    background: #f5f5f5;
}
/*头部背景图*/
.banner{
    width: 100%;
    height: 500px;
    background-repeat: no-repeat;
    background-size: cover;
    background-position: center center;
    max-width: 1920px;
    margin: 0 auto;
}
.banner .main{
    position: relative;
    height: 500px;
}
.banner .title{
    position: absolute;
    top: 50px;
    left: 0;
    background: rgba(32,42,69,0.8);
    color: #ffffff;
    padding: 18px 35px 20px 28px;
}
.banner .title h1{
    font-size: 34px;
    font-weight: bold;
}
.banner .title h2{
    font-size: 24px;
}
.banner .desc{
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 100px;
    padding: 25px 42px;
    line-height: 25px;
    background: rgba(255,255,255,0.8);
    color: #383b3d;
    font-size: 14px;
}
.banner .desc p{
    text-indent: 2em;
    height: 50px;
    overflow: hidden;
}

/*左边栏展示*/
.l_show{
    margin-top: 20px;
}
.l_show h2{
    font-weight: bold;
    margin-bottom: 10px;
}
.item_list .item{
    margin-left: 30px;
    margin-top: 30px;
}
.item_list .item:first-child{
    margin-left: 0;
}