.poster-main {
    width: 1000px;
    height: 500px;
    position: relative;
    margin: 0 auto;
}

.poster-main a, .poster-main img { display: block; }

.poster-main .poster-list {
    width: 1000px;
    height: 500px;
}

.poster-main .poster-list .poster-item {
    width: 200px;
    height: 500px;
    position: absolute;
    left: 0;
    top: 0;
}

.poster-main .poster-btn {
    position: absolute;
    top: 0;
    z-index: 10;
    cursor: pointer;
}

.poster-main .poster-prev-btn {
    left: 0;

}

.poster-main .poster-next-btn {
    right: 0;
}