Here are the links : MDN and Codepen.
Thank you in advance for your help !
Hello @TheRealSuperhuman
well done but if you like to go forward try to make not disappear when reach the edge of the convas so once the ball edge touch one of the convas edge it does not go forward but can move on any other direction
well done and great work and have a nice day 
I’ve changed the code. Is it better now?