Open the file: <root>Portals/<portal where you have the skin installed>/Containers/Caliper/container.css

Here you will find the main styling rules for the containers. You will notice that the styling for each container is in a section with a commented header.

You must know which container's font-size you would like to change.

For instance, if you would like to change the font-size for Container2
look for ".MegaDropDownContainer .Container_2"
you will find a block of css for this container.
(Conatiner2a and Conatiner2b also use styling from ".MegaDropDownContainer .Container_2")

The general font styling for this container is under .MegaDropDownContainer .Container_2 .Normal
However, you would want to change all matching font-sizes within that block of css,
because they are the specific font-sizes for anchor tags, div tags, paragraph tags, etc. and each of these rules will
override the general font-styling inherited from .MegaDropDownContainer .Container_2 .Normal

Hi Dave,

Here is a good forum post at DotNetNuke that covers this topic.  Let me know if you need more help:

http://www.dotnetnuke.com/Community/Forums/tabid/795/forumid/108/threadid/364908/scope/posts/Default.aspx