Issue titles invisible and repo name background white
Hi there, thanks for the stylesheet.
Looks like github has pushed an update.

As you can see Issue titles are the same colour as their backgrounds, and the background behind the repository name is white.
Also the page below the github footer is white.
Just noticed that the comment buttons below the issue comment box (the one I'm typing in now) and the notice about attaching files are miscoloured. Also the title of the issue ('ripdog commented 1 minute ago') is miscoloured.
If I may add to this: the grey text below the issues and in the pop-up that appears when hovering over the issue title are hard to read. The issue-link on hover appears dark blue on dark ground which is also a bit tricky.
As for fixes, issue titles become visible by changing text color for .Link--primary, .link-gray-dark and .Link--primary:hover, .link-gray-dark:hover , but I'm not sure (yet) if it will affect links in other places. ( :not(.IssueLabel) a:not(.IssueLabel) might be another option to play around with). The background for the repository name can be changed with .color-bg-secondary (but again, not sure, it'll affect other things). I didn't look into the pop-ups any further, so can't help with this one.

This is because GitHub has added the light-and-dark theme setting, and changing this setting to darker theme resolved both the issues.
edit: grammar