.chart-controls {
    margin: 20px 0;
    padding: 10px;
    background: #f5f5f5;
    border-radius: 4px;
}

.chart-controls label {
    margin-right: 10px;
    font-weight: bold;
}

.chart-controls select {
    padding: 5px;
    border-radius: 4px;
    border: 1px solid #ddd;
}