.jianju { width:1400px; height:280px;}

.poster-main{position: relative; margin:0 auto;}
.poster-main .poster-list .poster-item{position: absolute;left: 0;top:0;}
.poster-main .poster-btn{position: absolute; top:0; cursor: pointer;}
.poster-main .poster-prev-btn{left: 0;background: url("zbprev.png") no-repeat center center;}
.poster-main .poster-next-btn{right: 0;background: url("zbnext.png") no-repeat center center;}