Your motion is jerky because you can only move the background by a minimum of 1 pixel at a time. You can test this by setting the background-position to 10px and the transition time to 10s linear and you'll see that once per second the image shifts by exactly one pixel.
You could do something like this for your CSS. (Customize as needed).
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.