Custom Backgrounds
Via the Customizer you can quickly and easily change your website background.
Simply go to Appearance > Customize > Site Style & Settings > Site Layout, and locate the Background Color under the Site Background section (OceanWP v3.6.1 and below: Appearance > Customize > General Options > General Styling, Site Background option).
You're also able to use an image instead of a background color, or apply additional settings based on your Site Layout style via the Site Background Options panel.
Learn more about the Site Layout options in the Customizer.