ul{list-style:none}
.poster-main{position:relative; margin:60px 20px 20px 20px;}
.poster-main a,.poster-main img{display:block;width:100%;height:100%; border:0.5px solid #666}
.poster-main img{}.poster-main .poster-list{width:1000px;height:500px; margin:0px auto;}
.poster-main .poster-list .poster-item{width:200px;height:500px;position:absolute;left:0;top:0}
.poster-main .poster-btn{position:absolute;top:0;cursor:pointer;filter:opacity(1) brightness(1)}
.poster-main .poster-btn:hover{filter:opacity(1) brightness(1)}
.poster-main .poster-prev-btn{left:-100px;background:url(../images/about_left.png) no-repeat center left}
.poster-main .poster-next-btn{right:-100px;background:url(../images/about_right.png) no-repeat center right}
.poster-item-title{font-size:18px;text-align:center;line-height:48px;display:block}

@media only screen and (max-width: 768px) {
.poster-main{position:relative; margin:20px 0px;}
.poster-main .poster-prev-btn{left:0px;background:url(../images/about_left.png) no-repeat center left; background-size:40%;}
.poster-main .poster-next-btn{right:0px;background:url(../images/about_right.png) no-repeat center right;background-size:40%;}


}