body {
            font-family: Arial, Helvetica, sans-serif;
        }
        .mcontainer{
             margin: 0;
            padding: 20px;
            background-color: white;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background-color: #d6cece;
        }
        .container {
            width: 100%;
            max-width: 600px;
            background-color: white;
            padding: 40px;
            border-radius: 12px;
            box-shadow: 0 12px 25px rgba(0, 0, 0, 0.1);
        }

        h1 {
            text-align: center;
            color: #333;
            margin-bottom: 30px;
            font-size: 1.8em;
            border-bottom: 2px solid #eee;
            padding-bottom: 10px;
        }

        
        .section {
            margin-bottom: 30px;
            padding: 15px;
            border: 1px solid #ddd;
            border-radius: 8px;
            background-color: #e4e7e7;
        }

        .section h2 {
            color: #5c5b5b;
            font-size: 1.2em;
            margin: 0 0 15px 0;
            padding-bottom: 5px;
            border-bottom: 1px dashed #ccc;
        }

        /* Form Group (Label + Input) */
        .group {
            margin-bottom: 15px;
        }

        .group label {
            display: block;
            margin-bottom: 5px;
            font-weight: 600;
            color: #444;
        }

        /* Input and Select Styling */
        .group input,
        .group select {
            width: 100%;
            padding: 10px 12px;
            border: 1px solid #ccc;
            border-radius: 6px;
            box-sizing: border-box; /* Important for padding/border calculation */
            font-size: 1em;
            transition: border-color 0.3s;
        }

        .group input:focus,
        .group select:focus {
            border-color: #034ff3;
            outline: none;
            box-shadow: 0 0 5px rgba(0, 123, 255, 0.2);
        }
        
        /* Grid Layout for Row-based fields (e.g., city/state) */
        .row-group {
            display: flex;
            gap: 20px;
        }
        
        .row-group .form-group {
            flex: 1; /* Makes the groups share space equally */
        }

        /* Payment Card Specific Inputs (Card Number, CVV, Expiry) */
        .card-row {
            display: flex;
            gap: 20px;
            align-items: flex-end; /* Aligns items at the bottom */
        }

        .card-row .form-group:nth-child(1) {
            flex: 2; /* Card number takes up more space */
        }
        
        .card-row .form-group:nth-child(2),
        .card-row .form-group:nth-child(3) {
            flex: 1; /* Expiry and CVV share remaining space */
        }

        /* Submit Button */
        .submit-btn {
            display: block;
            width: 100%;
            padding: 15px;
            margin-top: 30px;
            background-color: #28a745;
            color: white;
            border: none;
            border-radius: 6px;
            font-size: 1.1em;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s;
        }

        .submit-btn:hover {
            background-color: #218838;
        }