down-level stage image centered and responsive

Hi All, I've created an animation which appears on a stage that is centered both horizontally and vertically but when edge loads the down-level stage it appears in the top left corner of the browser. How can I center this down-level stage using animate? Also, I have an adaptive container and different layouts so that the animation scales down depending on the screen size how can I scale this down-level stage? I'm trying to have the down-level stage match the animation as closely as possible, any assistance will be greatly appreciated. thanks