[fix] sphinx 3.1 CSS issues
[fix] sphinx 3.1 CSS issues

See sphinx-doc project, PR 7838 & 7484 with elementary patch to the basic CSS:

- https://github.com/sphinx-doc/sphinx/issues/7838#issuecomment-646009605
- https://github.com/sphinx-doc/sphinx/pull/7484#issuecomment-646058972

Signed-off-by: Markus Heiser <14dfd67dd72e7ac80c040b62bb932f1e121795cc@darmarit.de>

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