Hi can anyone please advise how to move this image across the screen i've been asked to set animation duration every 11 to 20 seconds max then set the % from 5 to 10 %, i am a CSS student and struggling with this one at the moment

Many thanks Doug

Try this:

https://webdesign.tutsplus.com/articles/css3-transitions-and-transforms-from-scratch--webdesign-4975