Does anyone here know how to fix the html code, correct the text and add color and numbers for me?

Question

Does anyone here know how to fix the html code, correct the text and add color and numbers for me? (I'm new to programming so I have little programming experience). See the code here: https://sololearn.com/compiler-playground/W9Rz08X1p54u/?ref=app

Answer 1

Remove the localstorage and fix the adding function since the value cannot become 6 12 etc. I've added the arrows for testing and basic coloring scheme but you can make your own.
https://sololearn.com/compiler-playground/W7UG09mSg57G/?ref=app

Answer 2

Remove the localstorage property on line 15 in the JS script tab, since the app playground does not have local storage accesss.