Thanks for all the great replies...
There are many times where we have small elements, that need to move from the left side, to the right side, or top to bottom, etc.
I want to get away from left, top for performance reasons (imagine you have 100 stars)
I edited my codepen to make this work without using left top...
http://codepen.io/anon/pen/sqtxp
Question: Do you guys think that having a container 100% width height will be worse performance then just using left, top?