#slider {
            position: relative;
            width: 100%;
            height: 100%;
            overflow: hidden;
        }
        #slider ul {
            position: relative;
            width: 100%;
            height: 100%;
            margin-top: 90;
            padding: 0;
            list-style: none;
        }
        #slider ul li {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: none;
        }
        #slider ul li:first-child {
            display: block;
        }