* { box-sizing: border-box; }
header, nav, main, footer { display: block; }

body { background-color: #000000;
       font-family: Verdana, Arial, sans-serif; }
       
wrapper { background-color: #ffffff; }
nav ul { list-style-type: none;
         margin-left: 0;
         padding: 10px; }
nav a { text-decoration: none;
        padding: 10px;
        font-weight: bold; }
nav:a link { color: #ffffff; }
nav:a visited { color: #eaeaea; }
nav:a hover { color: #000066; }
main { background-color: #ffffff; }
tr:nth-of-type(even) { background-color: #9BC1C2; }