Material You Calculator

This screenshot shows a simple calculator, designed taking some inspirations from Material You design.

Suggestions are welcome.

Did this as part of #DailyUI #004 challenge: Design a calculation element or interface. Is it a standard calculator, a scientific one, or specialty calculator for something such as a home mortgage or auto loan? Is it to forecast a calculation such as for a credit score? Is it for a phone, a tablet, a web app?