Epub reader: ability to input custom color values for text and background

[NoelBalana]

I just wanted to suggest if it would be possible to have a feature that enables users to set custom color values for the font and background color of Komga's epub reader? This could just be:

• An option within the server settings-- two input fields where a user can specify html/hex color values, one for font and the other for background color
• this effectively becomes a fourth option to the three default themes in Komga's epub reader

Rationale:
Reading comfort. Different folks respond differently to color, and the standard epub theme options may not be suitably comfortable for all users. I would be once such example, as the existing options do not make for comfortable reading in low light conditions for me, even when brightness is set to lowest. Enabling this feature would be a catch-all for all folks. Thank you