This commit fixes the placement of the TOC hover/active markers (dots) so that they are horizontally in the middle of the marker "rail" and vertically in the middle of the item's first line. This commit also refactors the `_toc.scss` to be more DRY (wrt styling the TOC markers/marker rail) and uses Sass variables and mixins to ensure that the styling is kept up-to-date wrt future typography changes to TOC items. Before: ![toc marker before][1] After: ![toc marker after][2] [1]: https://user-images.githubusercontent.com/8604205/107270751-03e3f400-6a54-11eb-9d77-5b0a3cfb1c2b.png [2]: https://user-images.githubusercontent.com/8604205/107270758-047c8a80-6a54-11eb-82c0-98b832c109a3.png PR Close #40802
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