When I took a look at the .css source code I saw that the developer used some kind of cryptography on the code to mask some parts of it (it’s not really readable): https://i.imgur.com/jV1fMKv.png
Can it execute something malicious on the back-end? That’s my concern. Would anyone have any input on this matter???
This looks like an embedded font file, it’s encoded binary in ascii but not cryptography. The encoding is a way of putting binary data into a text type of file.
Here is the font that it looks to be Google Fonts: Lora (after looking at the file in his git hub there are actually a few fonts embedded)
It would be very hard for just CSS to inject malware/virus without some other executable code such as java.
The author of the theme has a website that looks legit https://mulfok.neocities.org/ and his twitter account goers back to at least 2020 before I stopped scrolling.
Overall I would say it is probably safe. But I didn’t try it so I can’t say for sure.
Obsidian themes are single .css files. If theme creator wants to use custom fonts, backgrounds, icons etc, they can’t put those assets into a local folder and link from there. They can either link them from the web or include a base-64 encoded textual representation of those assets into the .css file itself. Since relying on internet connection is not always the best idea, you will find that a lot of authors of very popular themes have those “crypto”-looking sections in their code. It’s not something to worry about.