How to make it take up 100% screen size?

Some problems, glad if anyone can rectify..

So, I finally created my animated name. I have read the whole of the FAQ sections too. But I have little bit of problems, if anyone can help me.

1. How to make it take up 100% screen size ie. making it responsive. (FAQ section shows us how to do it in pixels, not in %.

2. Also, whenever I resize my screen, something awkward happens Have a look here http://s12.postimg.org/gqyk29h65/index.png