#chart {
    width: 100%;
    height: 400px; /* Or use 60vh for vertical responsiveness */
  }

  @media (max-width: 768px) {
    #chart {
      height: 300px;
    }

    .chart-buttons {
      flex-wrap: wrap;
      gap: 6px;
    }

    .chart-buttons button {
      flex: 1 0 48%;
      font-size: 14px;
    }
  }

  .chart-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
    justify-content: center;
  }

  .chart-buttons button {
    padding: 6px 12px;
    font-size: 16px;
    cursor: pointer;
  }