body{font-family:Arial, sans-serif;margin:0;padding:0;}header{background-color:#333;color:#fff;padding:10px 0;text-align:center;}nav ul{list-style:none;}nav ul li{display:inline;margin-right:20px;}.products{display:flex;justify-content:space-around;flex-wrap:wrap;padding:20px;}.product{border:1px solid #ccc;padding:20px;margin:10px;text-align:center;}footer{background-color:#333;color:#fff;text-align:center;padding:10px 0;position:fixed;bottom:0;width:100%;}