It isn't my fault if you think this site is ugly.
I don’t like the font.
But it is your font. This site doesn’t override your browser’s default font family. If you don’t like it you should configure your operating system or browser to use something that you like.
The font is too small.
Once again this is decided by your browser. If it is unreadable you should change your font settings.
I don’t like the background colour.
This site uses a dark theme, unless your browser says that you prefer a light theme, in which case it follows the preference. If that doesn’t suit you then you should configure your operating system or browser to tell sites what you like.
I don’t like your syntax-highlighting theme.
Well sorry, but browsers don’t have hints for this yet. 🙃