Change font style and size of code in Hugo Academic

I wanted to change the font and size of font of the code section in my Hugo Academic (the theme) webpage. I added the font name in the config.toml and I also know I have to add some CSS in the html files. I can’t figure out which one.

Can somebody help?

if you want to use custom font it is needed to add description for it in
look for example to
and after that use it in params.toml as

font = "<YOUR_FONT>"