Design a webpage that contains a calculator.
- It should be 4 function (add, subtract, multiply, divide)
- The calculator's functions should be written in javascript.
- It should allow you to make positive numbers negative/negative numbers positive via the +/- button (like on your standard calculator)
- It should have a clear button to remove the current input and an All Clear (AC) button to clear the entire memory of the calculator
- It doesn't have to handle numbers with more than 9 digits.
- Use any libraries that you feel appropriate.
- Time-box this task to no more than 4 hours.
Please create a github repository and give us the link when you are done.