Hi Abdul,
Did the build tool throw any errors?
I think the file where you import the other .scss files there is something wrong. You can copy it to: https://www.sassmeister.com/ and see if throws an error.
With kind regards,
Stephan
“It crashed the entire UI of the applicaiton including some default components and widgets css such border and colors.” this is slightly worrying.
Either calypso compiles, or it crashes, it doesnt destroy styling.
in sass you can escape a line with //
if you escape the import line, in theory it shouldnt load those fonts, and everything should be back to normal?
if it remains broken, than its not the font scss, but something else that might have not been compiled and is now compiling.