Mobile: TOC styling issue

[edibotopic]

If we intend to allow users to switch to Minerva when on desktop, the TOC styling will need to be fixed.
Because "Contents" here is a <h2> its inheriting custom styles from the section headers (borders, margins), I assume.

Note

On small devices, the TOC on a page seems to disappear, which is by-design for Minerva.

Screenshot of problem

Comparison to Wikipedia

Possible solution

Removing the inherited h2 styles below seemed to broadly work:

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Relationship to other issues

The margin: 24px 0 0.25em 0 on the h2 seems to be causing #13.