gbody { font-family: Arial, sans-serif; margin: 0; padding: 0; line-height: 1.6; }
header { background: #333; color: #fff; padding: 1rem 0; text-align: center; }
nav ul { list-style: none; padding: 0; }
nav ul li { display: inline; margin-right: 10px; }
nav ul li a { color: #fff; text-decoration: none; }
main { padding: 1rem; }
footer { background: #333; color: #fff; text-align: center; padding: 1rem 0; position: fixed; width: 100%; bottom: 0; }