Daily UI 004 - Calculator

Hi!, I'm ryosuke fujiki and work as UI Designer in Tokyo. This is my forth DailyUI(http://www.dailyui.co/) Challenge! I design UI and share the work on Twitter, Instagram(https://www.instagram.com/ryosukefujiki/) and my portfolio(https://ryosukefujiki.wordpress.com/) everyday. I’d appreciate it if you check my work and comment about how to improve. Thank you !