Set a color for an "active" or "current" link in a sidebar widget.

I have installed a nifty widget called Simple Sidebar Navigation in order to have several simple list menus appear on certain pages of my website only: http://user27263.vs.easily.co.uk/
You can see these different menus on:
http://user27263.vs.easily.co.uk/translation-writing
http://user27263.vs.easily.co.uk/the...ighting-design
and on the French pages of the site:
http://user27263.vs.easily.co.uk/traduction?lang=fr
http://user27263.vs.easily.co.uk/the...mieres?lang=fr

I have figured out how to change the Link and Hover colors in ATO>Style Widgets>Widget List Items, but I cannot find a way to make a particular menu link become a different color from the rest when it is current. For example, if I were to click on "Food and Wine" in the sidebar menu on http://user27263.vs.easily.co.uk/translation-writing, I would like the color of that link to be different from all the others while I am on that page, so that the user knows where they are more easily. Is there any way to do this?

I tried the plugin forum at http://www.ibsteam.net/forums/showth...p?t=856&page=2 but the moderator's replies are much more concise than on this wonderful bytesforall forum (where I have solved many little issues, thanks to the great detail provided!). I tried putting his code into various places, but just couldn't get it to work.

As I said, I was able to change the link and hover colors on that particular widget through ATO>Style Widgets>Widget List Items, so presumably there is something I could put in ATO>Add HTML/CSS Inserts>CSS Inserts that would do the trick. Any ideas?