* {
    margin:0;
    padding:0;
}

ul {
    list-style: none;

}

.tab {
   width: 100%; 
   height:464px;

    margin:0 auto;
    overflow: hidden;
    position: relative;
}

.tab .banners li {
    display: none;
}
/*显示的轮播项*/
.tab .banners li.active {
    display: block;
}
.tab .banners li img {
    width: 100%;
     height: 464px;
}
/*左右按钮*/
.tab .btn {
    width: 0px;
    height: 0px;
    position: absolute;
    top: 50%;
    margin-top: -30px;
    font:bold 30px/60px "宋体";
    background: rgba(255,255,255,.3);
    text-align: center;
    color:#fff;
    cursor: pointer;
}

.tab .btn-right {
    right: 0;
}

.tab .btn:hover {
    background: rgba(0,0,0,.3);
}

/*一组小点按钮样式*/
.tab .btns {
    position: absolute;
    bottom: 10px;
    background: rgba(255,255,255,0);
    padding: 5px;
    left: 50%;
    margin-left: -80px;
    /*border-radius: 10px;*/
}
.tab .btns li{
    width: 10px;
    height: 10px;
    background: #fff;
    float: left;
    border-radius: 5px;


}
.tab .btns li.active  {
    background: red;
}

.tab .btns li+li {
    margin-left: 10px;
}