* {
    margin: 0;
    padding: 0;
}
.banner {
    width: 100%;
    height: 600px;
    margin: 1rem auto;
    overflow: hidden;
    cursor: pointer;
    position: relative;
}
.banner .slide {
    width: 8000px;
    height: 600px;
    position: absolute;
    left: -1200px;
}
.banner .slide .pic {
    width: 1200px;
    height: 600px;
    line-height: 600px;
    text-align: center;
    float: left;
    font-size: 72px;
    color: white;
}
.banner .slide .a {
    /* background-color: black; */
    background: url(../img/lb-1.png);
}
.banner .slide .b {
    /* background-color: pink; */
    background: url(../img/lb-2.png);
}
.banner .slide .c {
    /* background-color: purple; */
    background: url(../img/ms.png);
}
.banner .dots{
    width: 100px;
    height: 30px;
    position: absolute;
    bottom: 10px;
    right: 2%;
    margin-left: -50px;
    z-index: 2;/*让圆点显示在轮播图上面*/
}
.banner .dots .dot{
    /*圆点的一些样式*/
    width:20px;
    height: 20px; 
    float: left;
    border-radius: 50%;
    margin:5px 6px;
    background-color: rgba(7,17,27,0.4);
    box-shadow: 0 0 0 2px rgba(255,255,255,0.8) inset;
    cursor:pointer;

}
.banner .dots .active{
    /*小圆点高亮的样式*/
    box-shadow: 0 0 0 2px rgba(7,17,27,0.4) inset;
    background-color: #fff;
}
.banner .arrow{
/*左箭头*/
    width: 0;
    height: 0;
    border-right: 30px solid rgba(255,255,255,.5);
    border-top: 30px solid transparent;
    border-bottom: 30px solid transparent;
    position: absolute;
    left:0;
    top: 50%;
    margin-top: -30px;
    z-index: 2;
}
.banner .arrow:hover{
    /*鼠标移动到箭头时候的样式*/
    border-right-color:white ;
}
.banner .next{
    /*右箭头*/
    left:auto;
    right: 0;
    top: 50%;
    margin-top: -30px;
    transform: rotate(180deg);
    z-index: 2;
}