fix indexing causing main thread freeze, various polish

Jacky Zhao

2023-07-04 ab9da02c60c962128820e6874e6f07c98bc3dda7

 quartz/components/styles/darkmode.scss

@@ -2,6 +2,7 @@
  position: relative;
  width: 20px;
  height: 20px;
  margin: 1rem;

  & > .toggle {
    display: none;