body {
 font-family: Arial, sans-serif;
 margin: 0;
 padding: 0;
 background: #f5f5f5;
 color: #222;
}

header {
 background: #0a3d62;
 color: #fff;
 padding: 15px;
 text-align: center;
}

nav a {
 color: #fff;
 margin: 0 10px;
 text-decoration: none;
}

main {
 padding: 15px;
 background: #fff;
}

footer {
 text-align: center;
 padding: 10px;
 background: #eee;
}