Calculator
This is simple calculator made by using HTML, CSS and Javascript. It has Day and Night mode feature which can be changed by sliding the switch at the top.
I have used three files (style.css, calculator.js, math.js) in it. I have used two files (style.css and calculator.js) in the index.html itself and other one file (math.js) I have imported from https://cdnjs.cloudflare.com/ajax/libs/mathjs/6.2.1/math.js
Click Here to see the Demo