Calculator and Pomodoro Clock project, welcome comment!

Here is my Calculator and Pomodoro Clock project, any comments or suggestions will be appreciated!

Calculator

demo: https://greyli.github.io/calculator/
Markdown

Pomodoro Clock

demo: https://greyli.github.io/pomodoro/
Markdown

Totally love the design of your calculator. One minor thing that bothered me is that the display is reset when the maximum of digits is exceeded.
Your Pomodoro Clock is also very beautiful, but difficult to use on a mobile phone.

Thanks! I will try to fix these problem (mobile issue is already solved~).