body{font-family:"Times New Roman",serif;background:white}main{width:94%;margin:20px auto;border:1px solid #4169a1;padding:10px}header{text-align:center}header h1{font-size:22px}nav{text-align:center;border-top:2px solid blue;padding:16px}nav a{margin:0 4px;color:#4038a8}h2{text-align:center;font-size:19px}p{text-align:justify}table{border-collapse:collapse;margin:20px auto;width:52%}th,td{border:1px solid #555;padding:5px}.mark{background:yellow}