*{margin:0px; padding:0px;font-size:20px;}
            header{padding:9px;padding-left:30px;color:white;background:blue;}
            menu{padding:4px;padding-left:30px;color:black;background:grey;}
            footer{color:white;background:black;}
            #demo p{text-align:center;padding:18px;}
            p span{padding:18px;}
            a{text-decoration:none;color:white;}