I'm not sure exactly where you're having an issue.. if you take a screenshot and point an arrow to what you want to change, we can point you in the right direction. Note that the listing module uses templates which are located in /templates and the CSS is built into the .php files themselves whereas the calendar uses themes which are in /theme. Themes are .css files only, the TOC part being at the top of the file, and the normal calendar's section being in the bottom part of the file (both sections are seperated by a significant number of blank lines).
The image with all parts of the calendar exploded showing what style affects it is something that I have on my To-Do list for the EPCTutorials site. I'm sure that it will be of help to many clients.
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