body { font-family: Arial, sans-serif; background: #fff; color: #222; margin: 0; padding: 0; }
header { background: #003366; color: white; padding: 10px 20px; display: flex; align-items: center; justify-content: space-between; }
nav a { color: white; text-decoration: none; margin-left: 15px; }
main { padding: 20px; }
footer { background: #f1f1f1; text-align: center; padding: 10px; }