I have installed multiple Obisidian themes from the Community Theme center in the application. And almost all of them have their body{} main section of the theme css written in a single line. It goes to as long as million characters in some cases and gives absolutely no readability for a user. Also, it sometimes crashes the text editor.
Why are these themes not written with proper code formatting standards?
I tried a few and haven’t noticed this. But I am just guessing that maybe they’re using Minify. Try to “unminify” them.
Cheers, Marko 
Maybe they are mimified?
You can check their GitHub page for non-mimified versions.
Okay, I think they are using custom fonts and they have embeded those fonts in the css file. That makes the file so bulky. Please the theme that I was using were written in a single line of code, so may be that was also adding to the bulk.
I found a snippet through which I could do what I was trying to do by editing the css. So, now the use case is no longer there for editing those theme files. But those folks should format there code properly… 
Oh, yeah, embedded fonts as base64 in a theme add to the length and make large sections of the theme.css unreadable even without the theme being minified.