when adding font files to projects, and using the @ fontface to css file, you need to also add the "format" at the end or each url. it works on yours locally becuse you have the font on your local system i think.
eg:
@font-face { font-family: "inter"; src: url(/assets/fonts/static/Inter-Bold.ttf) format(""ttf), url(/assets/fonts/static/Inter-SemiBold.ttf) format(""ttf), url(/assets/fonts/static/Inter-Bold.ttf) format(""ttf); }
to speed up adding fonts for challenges only (not good for real projects) use the @import feature on google fonts!
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