(...)
Everything works fine for me with cryptpad.fr, but I just wish if it could load a bit faster and work with dark themes.
(...)
I reckon that with the ChipMixer spreadsheet it takes some time loading all the information. Regarding dark themes, it actually has for both the interface and ONLYOFFICE! For changing to the dark theme in the CryptoPad interface - as announced on their blog[1] - just go over to
Settings ->
Appearance ->
Dark Mode. To change to dark theme in a ONLYOFFICE sheet just head over to
File->
Advanced Settings...->
Interface Theme ->
Dark. Now you should be able to run in a fully dark theme

[1]
https://blog.cryptpad.org/2021/02/24/status-feb-2021/