body { font-family: Arial, sans-serif; } header { background-color: #333; color: #fff; text-align: center; padding: 20px; } nav { background-color: #444; color: #fff; text-align: center; padding: 10px; } nav ul { list-style-type: none; padding: 0; } nav ul li { display: inline; margin-right: 10px; } nav a { color: #fff; text-decoration: none; } section { margin: 20px; } footer { background-color: #555; color: #fff; text-align: center; padding: 10px; position: fixed; bottom: 0; width: 100%; }