UI Challenge Day 4

Design a calculator. Standard, scientific, or specialty calculator for something such as a mortgage? Is it for a phone, a tablet, a web app?

Here is my submission for day 4! I have been wanting to try this "style" I have been seeing pop up on Dribbble and Instagram, I think it turned out pretty good just duplicating it from looking at others! (Although the white looks way better IMO). What do you think?