body { font-family: sans-serif; background: #f0f0f0; margin: 0; }
header, footer { background: #003366; color: white; text-align: center; padding: 10px; }
nav { background: #00509e; text-align: center; padding: 10px; }
nav a { color: white; margin: 10px; text-decoration: none; }
section { padding: 20px; }
table {
  width: 80%;
  margin: auto;
  border-collapse: collapse;
}
th, td {
  border: 1px solid #999;
  padding: 10px;
  text-align: center;
}