Finally got around to putting my custom theme onto Git.
Ebbsian is a light theme with grey sidebar and modern, image-backed headers. It features colourful underlined headings, and comes with a range of different callout/accent boxes.
Compatible with the Style Settings Plugin.
Disclaimers:
I am not a for-realsies developer
I have no idea if it works correctly on mobile, as I only really use desktop
Thanks very much for the quick response. That does the trick. The header text in edit mode is still in the original font - which is fine because I think that looks nicer
I achieved something similar (I think) with a different CSS selector;