Board Thread:General Discussion/@comment-45058067-20200307045046/@comment-44807868-20200307050956

It'll help to provide link to your wiki's CSS, as well as explain what customization you'd like to make to the headings.

The following selectors are what you'd use to customize some of the levels, 2 and 3, though: For the rest, I suppose it's obvious.

On a side note, you mentioned trying to customize h1 so just to let you know, h1 (level 1 heading) is recommended to not be used on pages.