.scroll {
    width: 100%;
    position: relative;
    overflow: hidden;
}
.scroll ul li {
	width: 100%;
    height: 109px;
    background-color: #fff;
    text-align: center;
    float: left;
    -webkit-transition: box-shadow .2s ease-out;
    transition: box-shadow .2s ease-out;
}
.scroll .next,  .scroll .prev {
    opacity: 0;
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    display: inline-block;
    cursor: pointer;
    z-index: 1;
    width: 28px;
    height: 62px;
    line-height: 62px;
    color: #fff;
    text-align: center;
    font-size: 30px;
    font-weight: 400;
    background: rgba(0, 0, 0, 0.5);
    font-family: simsun;
    transition: all ease-in .4s;
    text-decoration:none;
}
 .scroll .next {
    right: 0px;
}
 .scroll .prev {
    left: 0px;
}
 .scroll:hover .next {
    opacity: 1;
}
 .scroll:hover .prev {
    opacity: 1;
}