body {
    padding: 0px;
}
#container {
    width: 1050px;
    height: 500px;
    border: 0px solid #333;
    overflow: hidden;
    position: relative;
    margin: 0 auto;
    margin-top: 15px;
}
#list {
    width: 7350px;
    height: 400px;
    position: absolute;
    z-index: 1;
}
#list img {
    width: 1050px;
    height: 500px;
    float: left;
}
#buttons {
    position: absolute;
    height: 10px;
    width: 100px;
    z-index: 2;
    bottom: 20px;
    left: 475px;
}
#buttons span {
    cursor: pointer;
    float: left;
    border: 1px solid #fff;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #333;
    margin-right: 5px;
}
#buttons .on {
    background: orangered;
}
.arrow {
    cursor: pointer;
    display: none;
    line-height: 39px;
    text-align: center;
    font-size: 36px;
    font-weight: bold;
    width: 40px;
    height: 40px;
    position: absolute;
    z-index: 2;
    top: 230px;
    background-color: RGBA(0,0,0,.3);
    color: #fff;
}
.arrow:hover {
    background-color: RGBA(0,0,0,.7);
}
#container:hover .arrow {
    display: block;
}
#prev {
    left: 20px;
}
#next {
    right: 20px;
}