@adelhammoud a lil’ trick may help you
In Data editor, create a Template column and add this code:
<a style="position: fixed;
width: 100%;
top:10%;
right: 0%; z-index:-1;">
<img src="URL" /></a>
Replace URL to the Pic column. In the screen you wanna add this background, add a Rich Text component and the result will something like this 
(The code is not 100%, but when I improve it, it’s cool to fit the image in the whole screen)
