As haukex wrote, the monospace font is set in your browser config. However, there is one setting here which may help. In Display Settings, in the Code Listing Settings there is an option "Large Code Font" which, if checked, will increase the font size of the code listings without changing the font face. That might be all you need?

In reply to Re^3: Image::Thumbnail work under windows but not on linux (code font) by hippo
in thread Image::Thumbnail work under windows but not on linux by *alexandre*

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