body {
            font-family: Arial, sans-serif;
            padding: 20px;
            background: #f5f5f5;
        }

        h2 {
            margin-bottom: 20px;
        }

        .controls {
            margin-bottom: 20px;
        }

        select, button {
            padding: 10px;
            font-size: 16px;
        }

        .chart-container {
            background: white;
            padding: 20px;
            border-radius: 10px;
            max-width: 1200px;
        }

        #chart {
            width: 100%;
            height: 600px;
        }