body {
            margin: 0;
            padding: 0;
            font-family: "Segoe UI", Arial, sans-serif;
            background: linear-gradient(135deg, #4e54c8, #8f94fb);
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .container {
            background: white;
            padding: 40px;
            width: 350px;
            border-radius: 15px;
            box-shadow: 0px 10px 30px rgba(0, 0, 0, 0.20);
            text-align: center;
            animation: fadeIn 0.6s ease-in-out;
        }

        h2 {
            margin-bottom: 20px;
            color: #333;
        }

        input[type="submit"] {
            margin-top: 20px;
            width: 100%;
            padding: 12px;
            background-color: #4e54c8;
            border: none;
            border-radius: 8px;
            color: white;
            font-size: 16px;
            cursor: pointer;
            transition: 0.3s ease;
        }

        input[type="submit"]:hover {
            background-color: #3c42a6;
        }

        @keyframes fadeIn {
            from {opacity: 0; transform: translateY(-10px);}
            to   {opacity: 1; transform: translateY(0);}
        }