Add a background for extra personalization and to help convey the campaign’s tone of voice.
Click the pencil icon in the top right of your campaign in editor view (you might have to scroll to the right if your screen is zoomed in close):

Alternatively, you can find this option in the campaign menu, under Edit:

Then ‘Layout’:

Choose a colour, add a custom colour, or upload a picture. We encourage you to meet the recommended picture size, as smaller pictures will look fuzzy or grainy and take away from the campaign’s visual appeal.