ImANoob

Hello, I purchased a website template and I'm in the process of editing everything. I'm a little stuck on trying to find the colour of the background in the style.css file. Nowhere in the table of contents I can see anything related to the background colour. In the 'General' section I can only access stuff for typography, buttons, inputs, sections and breadcrumb. It's more than 2000 lines of code and checking each background-colour code is going to take ages. How can I find the relevant section resnponsible for the background colour? Thanks