body{font-family:Arial,sans-serif;margin:0}header,footer{background:#0d6efd;color:#fff;padding:20px}.container{max-width:1100px;margin:auto;padding:20px}.btn{background:#0d6efd;color:#fff;padding:10px 18px;text-decoration:none;border-radius:4px}.card{border:1px solid #ddd;padding:16px;border-radius:8px;margin:10px 0}