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I tried my best to make the page responsive. Do let me know if there are any improvements that can be made and bugs if found. Thank-you!

I have only implemented 2 themes though, sorry for that. I wasn't aware of traditional grid system so I had to use bootstrap grid system in order to layout the calc buttons. Anyways, please do check how I made the transition from Light <-> Dark (from calc.js line: 215) and suggest me if there's a rather easier or concise way to implement the same.

PS: I'm still in the learning stage, will be learning ReactJS soon.