.poster-main{position: relative;width: 900px;height: 270px}
.poster-main a,.poster-main img{display:block;}
.poster-main .poster-list{width: 900px;height: 270px}
.poster-main .poster-list .poster-item{position: absolute;left: 0px;top: 0px}
.poster-main .poster-btn{position: absolute;height: 100%;width:100px;top: 0px;z-index: 10;background-repeat: no-repeat;}
.poster-main .poster-prev-btn{ right: 0px;}
.poster-main .poster-next-btn{ left: 0px;}
.poster-main .poster-prev-btn-1 {
    left: 0;
    right: auto;
    background-position: 0 center;
    background-image: url(../images/left.png);
}
.poster-main .poster-next-btn-1 {
    right: 0;
    left: auto;
    background-position: 100% center;
    background-image: url(../images/right.png);
}