message: fine tune void icon
diff: $item-header-spacing: 5px;
  $icon-bg-fill: rgba(0, 0, 0, 0.4);
  -$icon-bg-shadow: rgba(0, 0, 0, 0.7);
  +$icon-bg-shadow: rgba(0, 0, 0, 1);
  .item-header {
  background-color: #fff;
  @@ -118,7 +118,7 @@ $icon-bg-shadow: rgba(0, 0, 0, 0.7);
  transparent 90%,
  transparent 100%
  );
  - filter: brightness(200%) drop-shadow(0px 0px 0px $icon-bg-shadow)
  + filter: brightness(250%) saturate(60%) drop-shadow(0px 0px 0px $icon-bg-shadow)
  drop-shadow(0px 0px 1px $icon-bg-shadow);
  }
  &.arc {
  