Thank you, Davide!
We will fix these issues shortly.

Themes support was enabled today via a regular web update on the root server. The development of this feature is ongoing, and we'll continue to refine and improve it in the coming days.

For now, the light theme is enabled by default. Once the work is complete, the system theme will become the default option.

Best regards.

Wrote

I think some icons should be adapted to have more contrast, though (f e. the ones in the post editor and the ones on top of the single posts). The quote box has some issues too.

Corrected.

Quote region is fine now, but icons seems vanished?

Davide, can't confirm. Works ok on Chromium based browsers

Can confirm, seems a browser engine issue. On chromium browsers works just fine, on firefox based browsers (both desktop and mobile) icons are not visible.

I see, issue is in Firefox... Ok, will handle.

Wrote

Can confirm, seems a browser engine issue. On chromium browsers works just fine, on firefox based browsers (both desktop and mobile) icons are not visible.

Finally fixed. Thank you for reporting this issue!