Markdown heading styles aren't sufficiently distinct
Markdown is rendered wrongly on the issue page. Second level and third level headings are shown the same way.
Steps to reproduce
- Create a wiki page with the following content:
# Heading test
First level
## foo
Second level
## bar
Second level
### foobar
Third level
Expected behavior
- Heading
bar
andfoobar
should be rendered differently
Observed behavior
- Heading
bar
andfoobar
are rendered the same way - Also shown in https://gitlab.com/test-repositories/test-issue-865/wikis/home