body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
.highcharts-figure, .highcharts-data-table table { min-width: 320px; max-width: 900px; margin: 1em auto; }

/* ✨ 아래 코드를 새로 추가합니다. ✨ */
#container {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 111.75%; /* (SVG 세로 / 가로) * 100 = (856 / 766) * 100 */
}

#container .highcharts-container, 
#container .highcharts-root {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}