body { font-family: Arial, sans-serif; margin: 0; padding: 0; background: #f4f4f4; }
header { background: #333; color: white; padding: 1em; text-align: center; }
nav a { margin: 0 1em; color: white; text-decoration: none; }
section { padding: 2em; background: white; margin: 1em; }
footer { text-align: center; padding: 1em; background: #eee; }
img { max-width: 100%; height: auto; }