I'm having an issue with clouds which doesn't fully show on this pen since it looks as if they are moving all the way through. I'm tyring to get them to move from left to right. On the actual site, they stop at a certain point and disappear and start over. How do we calculate position responsively and make it move along the screen? See the Pen yKdoKX?editors=0010 by joseterrera (@joseterrera) on CodePen