...
Email Background Image - How to Modify
Users can change or modify the appearance and layout of images once they have been selected.
Change selected images. Clicking the Change Image button allows users to change the selected image.
Edit a selected image. Clicking the Edit Image button allows users to edit the selected image.
Set the Repeat Image toggle.
Turning the Repeat Image Toggle ON centers one image and replicates additional images as necessary on both sides of the image based on screen size.
Turning the Repeat Image Toggle OFF makes the image the background and adds the background color for any space remaining on both sides of the image based on the screen size.
Adjusting the Position X and Y options allows users to determine the background image's exact horizontal and vertical placement.
...