body{scroll-behavior:smooth;padding:5px;}table, td, th{border:2px solid blue;border-collapse:collapse;}div.table{overflow-x:auto;}.mark, mark{background:tomato;color:white;}u, .u{font-family:serif;}topic, .topic, #topic, #menu, .menu{width:30%;float:left;}main, #main, #page, page{width:70%;float:left;}h1, h2, h3, h4, h5{padding:5px;text-align:center;color:white;font-weight:bold;}h1{background:#800;}h2{background:green;}h3{background:#008;}h4{background:#000;}nav a, .nav a, #nav a{padding:10px 20px;text-decoration:none;display:inline-block;color:white;font-size:20px;}#nav, .nav, nav{background:#222;position:sticky;top:0;padding:5px;}.active{background:#04d;color:white;} menu{list-style-type:none;}.menu a, #menu a{display:block;padding:9px 19px;text-decoration:none;}.clock{width:20%;background:#006;color:white;padding:9px 3px;} .calendar{width:80%;background:green;color:white;padding:7px 5px;float:left}