.banner{
    width: 100%;
    height: 320px;
    overflow: hidden;
    position: relative;
}
.banner .img_list{
    position: absolute;
}
.banner .img_list .img{
    width: 1200px;
    height: 320px;
    float: left;
    position: relative;
}
.banner .img_list .img img{
    width: 100%;
    height: 100%;
}
.banner .img_list .img .title{
    line-height: 60px;
    height: 60px;
    width: 100%;
    position: absolute;
    left: 0;
    bottom: 0;
    background: rgba(0,0,0,0.6);
    color: #ffffff;
    padding-left: 20px;
    font-size: 16px;
}
.banner .mark{
    position: absolute;
    right: 30px;
    bottom: 20px;
    z-index: 11;
}
.banner .mark span{
    display: inline-block;
    width: 16px;
    height: 16px;
    background: url(../image/ellipse.png) no-repeat;
    cursor: pointer;
    margin: 0 5px;
}
.banner .mark span.active{
    background: url(../image/ellipse_active.png) no-repeat;
}