body {
            font-family: Arial, sans-serif;
            text-align: center;
            background: #f4f4f4;
            margin: 0;
            padding: 0;
        }

        .container {
            width: 90%;
            max-width: 400px;
            margin: 50px auto;
            padding: 20px;
            background: white;
            border-radius: 10px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
        }

        form {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        input, textarea {
            width: 100%;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 5px;
            box-sizing: border-box;
            font-size: 16px;
        }

        button {
            background: #28a745;
            color: white;
            padding: 10px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
        }

        button:hover {
            background: #218838;
        }

        .mensagem {
            margin-top: 10px;
            color: green;
        }

        #btnVoltar {
            display: none;
            margin-top: 10px;
            background: #007bff;
        }

        #btnVoltar:hover {
            background: #0056b3;
        }