Hi,
works fine with Konquerer and Firefox on Linux/KDE.
A would either center the code-box with some margins (margins-left=2ex;margins-right=2ex;}
or let ist expand to the full with of the content div (margins-left=0ex;margins-right=0ex;}.
The copyright-notice at the bottom of the page should be turned into a link to the Playground licsence-page. (look for "$SkinCopyright" in file skins/abitzmodern/abitmodern.tmpl)
Eberhard