body { font-family: Arial, sans-serif; margin: 0; padding: 0; } header { background-color: #333; color: #fff; padding: 20px; text-align: center; } nav { background-color: #ccc; display: flex; justify-content: center; } nav ul { list-style: none; margin: 0; padding: 0; display: flex; } nav a { color: #333; display: block; padding: 20px; text-decoration: none; } main { padding: 20px; } section { margin-bottom: 20px; } footer { background-color: #333; color: #fff; padding: 20px; text-align: center; }