body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #f5f5f5; color: #333; }
header, nav, footer { background: #111; color: white; padding: 10px 20px; }
nav a { color: white; margin: 0 10px; text-decoration: none; }
main { max-width: 900px; margin: auto; background: white; padding: 20px; }
h1, h2, h3 { color: #111; }
ul { margin: 10px 0; padding-left: 20px; }
footer { text-align: center; font-size: 0.9em; margin-top: 20px; }