Problem

The contrast of footnote texts clearly is too low, making them hard to read (light grey on white). However, they should not be too invisible, since footnotes sometimes contain important information.
Low contrast is annoying for everyone, but it is particularly bad for visually impaired people and reduces accessibility.

Reproducible Project

This is a text with an interesting footnote [1]_

.. [1] When compiling the documentation, the contrast of this text will be way too low

Expected Results

Consider using the normal black text colour for footnotes, or at least take a darker grey.

Environment Info

• Python Version: 3.8.5
• Sphinx Version: 4.0.2
• RTD Theme Version: 0.5.2