When you set up a Group, a landing page where you show all the promotions is created. You can customize this landing page with some different images that we describe below with their characteristics:
- Header image. Sizes: 810px width x 360px height
- Promotion image in Group's landing page. 300px widht x 245px height
- Background. Minimum 2.000px widht x 800px height
- Facebook tab image: 111px width & 74px height
To submmit these images and customize the landing page with code, follow the settings instructions of this link.