zenity radiolink is too small. How to make it larger?

From: http://www.linuxquestions.org/questions/linux-software-2/zenity-with-pango-am-i-missing-software-package-4175540712/

System: Ubuntu 14. Downloaded April 2015

People have posted about using pango in a zenity command. Something like this should work:

    zenity --info --text '<span color="green"<</span>'"Hi mom"

but no color change occurs in the zenity box.

Do I need another package to make it work?

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but this isn't the real issue because it is not the --info I want to make bigger but the --list --radiolist which has tiny font and therefore a tiny window. I'd like to use something like Courier 16 and a window size proportional to it. I'd also like the "span" to work to set colors, font size, etc.

How do I do that?

Note, I am running Server Ubuntu with openbox. System is for a simple museum application to display questions to visitors on a touchscreen to test their knowledge for fun.
I am a volunteer developing the project. Everything works, including the zenity command (except for size)