body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            margin: 0;
        }
        
        .container {
            background-color: white;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            width: 300px;
        }
        
        h1 {
            text-align: center;
            color: #333;
        }
        
        .form-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 5px;
            color: #333;
            font-weight: bold;
        }
        
        input {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 4px;
            box-sizing: border-box;
            font-size: 16px;
        }
        
        input:focus {
            outline: none;
            border-color: #4CAF50;
            background-color: #f9fff9;
        }
        
        input:disabled {
           background-color: #e9ecef;
            cursor: not-allowed;
        }
        
        button {
            width: 100%;
            padding: 12px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 4px;
            font-size: 16px;
            font-weight: bold;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        
        button:hover {
            background-color: #45a049;
            }
        
        button:active {
            background-color: #3d8b40;
        }