Headings with vertical gradient colors

[DutchPete]

In Dark mode, the white is on top and grades into link-color at the bottom. In Light mode it is the other way round. This is a small issue that does not affect the functionality of the theme in any way, but it would be nice to have it consistent.

[hungsu]

oof, yep that's ugly. I'm at work but can hopefully fix this later this evening