Feedback on Markdown Previewer

I just finished my Markdown Previewer project with React, ReactMarkdown and a little Bootstrap. All test pass, it still needs a bit of love designwise though. I would like some feedback and especially to know if the webfont I have used for code and tables is working, it is the first time I have used the @font-face directive. I have used the Cascadia Code PL so it is easy to see if the symbols in the codeblock show up as powerline symbols or regular just => >= <= == === !=