With Shift Pro you can change the background of your to an image. To add a background image:
- Visit the Customizer (Appearance → Customize)
- Click on the Background section
- Click on the Background Images section
- Click the Select Image button
- Use the media manager to upload a new image or select an existing image, and click the Choose Image button
- Click the Save & Publish button to save your changes
The background image you uploaded is now being used as the backdrop for your site.