body,
ul {
    padding: 0;
    margin: 0;
}
ul {
    list-style: none;
}
.wrap {
    position: relative;
    width: 1200px;
    height: 400px;
    margin: 100px auto;
    top: 60px;
}
.content {
    position: absolute;
    width: 1200px;
    height: 400px;
}
.content li {
    position: absolute;
    background-size: 100% 100%;
    cursor: pointer;
}
.wrap a {
    position: absolute;
    display: none;
    z-index: 2;
    top: 43%;
    width: 60px;
    height: 60px;
    margin-top: -30px;
    font: 36px/60px "宋体";
    text-align: center;
    text-decoration: none;
    color: #fff;
    transition: background 1s ease;
    background-position: 255;
}
.wrap a:hover {
}
.prev {
    left: 30px;
}
.next {
    right: 30px;
}