You can add images as a background to each structure module in your campaign.
In the campaign editor, click on the structure module into which you’d like to put a background image (this will be to the sides of the content modules):
In the editor box on the right you’ll see a toggle for Row background image. Turn that that on. It will turn blue and produce a background image menu.
Click the Change image button to select an image.
You’ll be able to choose an image from your uploaded photos, upload a new image from your computer, import an image from other social media websites, or search for free photos. Click on the name of the photo to make it your new background image.
After adding an image as a background, you have a few options for editing the layout of the image:
To remove the image, simply toggle the Row Background image option back to off, and that will remove and reset the background.
To achieve this you will have to build your entire email using a single row by only adding ONE Structure element into your email and then adding all your Content modules inside of it.