q3stats/frontend/sass/components/ChartComponent.scss

.q3stats-chart {
  height: 400px;

  .highcharts-loading {
    opacity: 1 !important;

    .highcharts-loading-inner {
      position: static !important;
      top: 0px !important;
      visibility: hidden;

      &::after {
        @include loading;
        content: '';
        display: block;
        visibility: visible;
      }
    }
  }
}