Closed issue by mjyut on void-packages repository

https://github.com/void-linux/void-packages/issues/36557

Description:
There are some issues with the CSS in the [manual page](https://man.voidlinux.org/).
Especially if the user's browser is set to a dark theme, it will be difficult to read.
Even in the light theme, there are some problems such as wrapping the navigation bar.


### System

* package: `void-man-cgi-1.14.6_1 (mdocml-1.14.6_1)`


### Expected behavior

![image](https://user-images.githubusercontent.com/8846481/162234994-243be02f-d1c2-4474-8c04-18d37fda50ff.png)


### Actual behavior

![image](https://user-images.githubusercontent.com/8846481/162235204-07a0743e-6c57-4884-a444-7a9335f21539.png)


### Steps to reproduce the behavior

Browse [manual page](https://man.voidlinux.org/) using graphical browser such as Firefox.
If you're testing a dark / light theme switch, Firefox's developer tools [have that feature](https://discourse.mozilla.org/t/how-to-test-preferred-color-scheme-dark-mode-with-firefox/40769/5).