message: fix(devtools): resize dark mode and cursor
diff: & > .as-split-gutter {
  flex-direction: row;
  - cursor: col-resize;
  + cursor: ew-resize;
  height: 100%; // <- Fix safari bug about gutter height when direction is horizontal.
  & > .as-split-gutter-icon {
  & > .as-split-gutter {
  flex-direction: column;
  - cursor: row-resize;
  + cursor: ns-resize;
  width: 100%;
  .as-split-gutter-icon {
  }
  }
  }
  +
  +:host-context(.dark-theme) {
  + & > .as-split-gutter {
  + background-color: #3f3f3f;
  + }
  +}
  