body { font-family: Arial, sans-serif; margin: 0; padding: 0; }
header { background: royalblue; color: white; text-align: center; padding: 2em; }
nav { background: mustard; padding: 1em; text-align: center; }
nav a { margin: 0 15px; text-decoration: none; color: black; font-weight: bold; }
main { padding: 2em; }
footer { text-align: center; padding: 1em; background: #333; color: white; }