This works perfect!
Thanks for your help
While we are at it, can I ask another question related to this design?
How can I pause first black section at the left corner of screen and first grey section should overlap and scroll over it. doing the same for 2nd group. Basically, when black sections reach the left of screen, they get pinned.
Also, how do I make it draggable (horizontally)? I have used Draggable plugin but I only want that to drag in +x position not -x