Change background from template


In the template that I purchased a template from Webflow, the background is orange with white words and turns black with white words when you scroll down. I am trying to change it so that the background is white with green words on top and black with white words on the bottom.

I cannot find where to make those changes in Designer. Also, when I click on the preview, the background is all black until I click “Home” in Navigation. Does anyone have insight to where those changes could be made?

Here is the read-only preview-link for my website:

Here is my site Read-Only: LINK
(how to share your site Read-Only link)