If you type in enough 9's in the "cash on hand" slot, the "middle box" will get out of bounds. Should add some JS to make the fonts a bit smaller when there are too much symbols in the row ;)
I just amused myself by figuring out when rounding would kick in, I set the delta of cash in and cash out to 100 and put in 99.99 then just began appending 9's to the end until it switched from 'now' to 'one month' never has .000000000000009$ mattered so much.