#screen{    margin:0 auto;    position:relative;    height:450px;    width:600px;}    #navigation{        width:700px;        background-color:#fff;    }        #navigation ul{            float:left;            margin:0;        }            #navigation li{                float:right;                margin:0 0 0 4px;                padding:5px 10px;                background-color:#fff;            }    #sections{    overflow:hidden;    width:400px;    height:400px;    clear:left;    margin-left:100px;}#sections ul, li{        margin:0 270px 0 0;        list-style:none;}    #sections ul{        width:20000px;    }        #sections li{            float:left;            padding:11px 0;        }            #sections table{                width:600px;                margin:16px 0;                padding:0 15px;            }                #sections table td {                    margin:0;                    padding:10px 0 0 15px;                    border:none;                    width:430px;                    text-align:left;                    vertical-align:top;                    font-size:1.2em;                    line-height:150%;                }.clear{    clear:both;    width:0;    height:0;}