Change background on Studio Theme using child.css

I am using the Studio Parent/Child and am having trouble the changing the #ececec background color to something I specified. I even tried to use a image and had the same effect. No matter what I do, the #ececec color found in theme-options.php seems to override?

How do I fix this but make sure I don't "break" the theme from future updates?


body {
background: #eae0d6;