I’ve edited the background color of the sidebar where the widgets live, but that’s only changed part of the sidebar. Underneath the widgets, it’s a gray color. You can see the problem here: http://trullingerphotography.com/
Could anyone help me with which class in the stylesheet I need to change? Thanks!
Yep. You need to change the #content declaration. Basically, the grey color is contained in the image img/sidesep.gif (which is a 301px x 1px image that is used to create the faux column on the left side.) Just create a 301px x 1px image using the color scheme you prefer and use it to replace the sidesep.gif image.
I hope that makes sense. If not, feel free to request further clarification.