body { font-family: Arial; margin: 0; padding: 0; background: #f7f7f7; }
header, footer { background: #005500; color: white; padding: 20px; text-align: center; }
nav a { margin: 0 10px; color: white; text-decoration: none; }
.product { display: inline-block; margin: 10px; padding: 10px; background: white; border-radius: 5px; width: 200px; }
.product img { max-width: 100%; height: auto; }