Visited links impossible to read with dark theme

[Armin Beširović]

In the latest updates to openbsd.org there's a new theme added for users of 
dark themes via the prefers-color-scheme CSS directive.

Visited links appear in purple which has extremely poor contrast and is 
impossible to read, see this example screenshot: https://i.imgur.com/E74CvQK.png

An easy solution would be to update the CSS with something like:

:visited {
    color: #F6BAFF;
}

inside the prefers-color-scheme.

Cheers,
Armini