1body {
 2    font-family: Arial, sans-serif;
 3    margin: 20px;
 4    background-color: beige;
 5}
 6
 7nav > a:link, nav > a:visited {
 8    color: blue;
 9    margin-right: 10px;
10}
11  
12nav > a:hover, nav > a:active {
13    text-decoration: dotted;
14}
15
16#main-container {
17    margin-top: 20px;
18}
19
20thead {
21    font-weight: bold;
22}
23
24table {
25    width: 100%;
26}
27
28button {
29    display: block;
30    margin: 20px auto;
31    padding: 10px 20px;
32    font-size: 16px;
33}