* {
    margin:0;
    padding:0
}
#div1 {
    height:300px;
    margin:20px auto;
    position:relative;
    background:white;
    overflow:hidden
}
#div1 ul {
    position:absolute;
    left:0;
    top:0
}
#div1 ul li {
    float:left;
    width:200px;
    height:100px;
    list-style:none
}