Thanks for your reply. I just grep()ed the sources:

geshi/css.php: 'medium', 'message-box', 'middle', 'mix', 'monospace', 'n-resize',
geshi.php: var $overall_style = 'font-family:monospace;';
geshi.php: var $code_style = 'font: normal normal 1em/1.2em monospace; margin:0; padding:0; background ...

Hi,

I installed Geshi and it seems to work - at least the highlighting, but the font is not in monospace and source code in proportional fonts is ugly. Is this an configuration/installation error? There are geshi classes in the div, but not in the delivered css files.