Customize your backgrounds
To customize the background of your site, first, log in to your site's panel and then go to "yourdomain.com/panel/addons/brandeditor".
There, under the "Colors" tab, set the custom color you want to use besides "Body Background".
You can further edit your background by adding a background image on the homepage. To do this, go to "yourdomain.com/panel/addons/homepage/1/edit" and there, in "Advanced Inline CSS styling", you can add the CSS code for the background image.
You can even change the background of the sections on the homepage. To do this, go to "yourdomain.com/panel/addons/homepage" and choose the section you want to customize the background of and click the edit icon beside it. Then on the new page, choose the background you like from the dropdown and click submit. The background color of the section you chose is changed now.