How do I make the start menu wider?

[foxdenvixen]

Hi,
I am attempting my first customization after getting lots of inspiration here. I am currently tweaking a theme called Egypt because I like the light backgrounds (my eyes are getting older!) The theme I am working on is based on Pirates of the Caribbean. I want to make the start menu wider than the default when not in extended mode. I have a feeling that it has something to do with the margins but I have not been able to get it work no matter how much I tweak it. Attached is how I want it to look. Any guidance on this process will be greatly appreciated.

BTW, just to let you know, I am female and a web designer and love learning how to make my own customizations. I also want to learn how to make my own docks and icons but that will come later.

Attachment 42804