body{font-family:sans-serif;margin:0;padding:0;background-color:#f4f4f4}.container{width:80%;margin:20px auto;background-color:#fff;padding:20px;border-radius:8px;box-shadow:0 0 10px #0000001a}h1,h2{color:#333}label{display:block;margin-bottom:5px}input,button{margin-bottom:10px;padding:8px;border:1px solid #ddd;border-radius:4px}button{background-color:#5cb85c;color:#fff;border:none;cursor:pointer}button:hover{background-color:#4cae4c}.error{color:red;margin-bottom:10px}nav{background-color:#333;padding:10px 0;text-align:center}nav a{color:#fff;text-decoration:none;margin:0 15px}nav a:hover{text-decoration:underline}table{width:100%;border-collapse:collapse;margin-top:20px}th,td{border:1px solid #ddd;padding:8px;text-align:left}th{background-color:#f2f2f2}