MyBB Community Forums

Hi there i recently installed mybb and are converting a theme to my needs and i'v been hunting through the css files and cannot find where to change the wrapper color...its the white background on my website(http://www.nightlyambitions.com/forum/) and am curious if someone could point me to where i can change its color i am no pro but i am adamant at it any help is appreciated!

which version of MyBB you are using and which theme ? (give its link) - can you show your requirement with an image ..