Once downloaded, enter an alternative text in the Alt Text box, which will be the description of the image.
This text will be displayed on the site if the image does not appear, and will help SEO (search engine optimisation).
Click on Set image when done.
Note on the background image
- Width: 1950px
- Height: 900px
- Resolution: 72 ppi (pixels per inch)
- File type: JPG
A smaller size would create a blurred image on some screens or not covering all the background.
Too much resolution will slow down the display of the site.