body {
            font-family: Arial, sans-serif;
            background: linear-gradient(to right, #00c6ff, #0072ff);
            color: #333;
            padding: 20px;
        }
        .container {
            background: #fff;
            border-radius: 10px;
            padding: 20px;
            max-width: 700px;
            margin: auto;
        }
        input, select, textarea, button {
            width: 100%;
            padding: 8px;
            margin: 8px 0;
            box-sizing: border-box;
        }
        button {
            background: #0072ff;
            color: white;
            border: none;
            cursor: pointer;
        }
        h2 {
            text-align: center;
        }
        .mensaje {
            color: green;
            font-weight: bold;
        }