body { font-family: Arial, sans-serif; margin: 0; padding: 0; background-color: #f4f4f4; }

header { background-color: #333; color: #fff; padding: 1em 0; text-align: center; }

header nav ul { list-style: none; padding: 0; }

header nav ul li { display: inline; margin: 0 1em; }

header nav ul li a { color: #fff; text-decoration: none; }

main { padding: 2em; }

footer { background-color: #333; color: #fff; text-align: center; padding: 1em 0; position: fixed; width: 100%; bottom: 0; }