Feedback: try crash my JavaScript calculator

Feedback: try crash my JavaScript calculator
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I’m complete JavaScript calculator and need your feedback. Some bugs can alive. Can someone test it?
Or just engoy and tell me what you think about design.
click and _blank to codepan
Thanks for your attention, /username/.


The moving background is distracting other than that the calculator works fine:)


I think you’re right about the background, but let it remain as the twist of the design.

Thanks for feedback! It’s help me, really.


0.7 + 0.1 should be 0.8, but your calculator displays 0.7999999999999999


Surprise…I try fix it tomorrow; a hunch tells me it’ll be fun.


Thank you for this bug. I know, but forgot this feature binary numbers. I fix it, look at if you have time.
Solution is not elegant, but work (I hope).