Hi Karla,
Thank you for buying our theme. We hope it will meet all your expectations! 🙂
To change the main background color of your website, please go to Customize > Appearance > Global > Content > Background Color.
Note that each Grimlock block in your page can have a custom background color. To change the background color used in a Grimlock block, go to Edit Page and click on the block you want to edit. Then, in the Style tab on the right, you’ll be able to edit the background image, background color and add even a gradient.
Please find the attached screenshots.
If you have further questions or requests, feel free to create other forum topics.
Best,