body {font-family: Arial, sans-serif;margin: 0;padding: 0;background-color: #f4f4f4;}
header {background-color: #003366;color: white;padding: 1em;text-align: center;}
nav ul {list-style: none;padding: 0;text-align: center;}
nav ul li {display: inline-block;margin: 0 1em;}
nav ul li a {color: white;text-decoration: none;}
main {padding: 2em;}
.product {background: white;border-radius: 8px;box-shadow: 0 0 10px rgba(0,0,0,0.1);margin: 2em auto;max-width: 400px;padding: 1em;text-align: center;}
.product img {max-width: 100%;border-radius: 8px;}
button {background-color: #28a745;color: white;border: none;padding: 0.8em 1.2em;border-radius: 4px;cursor: pointer;font-size: 1em;}
button:hover {background-color: #218838;}
footer {background-color: #003366;color: white;text-align: center;padding: 1em 0;position: relative;bottom: 0;width: 100%;}