<font face="courier new"><span style="background-color:#e7e8f5; color:black">{param}</span></font>
That above code will use the 'Courier New' fixed width font (the same font used in EAB's [CODE] tag), give it the background colour the same as your 3rd image, and keep the font colour black.
Is that what you're asking Leffmann? And just to clarify, what you're wanting isn't to be included within [CODE] tags as RCK mentioned earlier?