Little Help With Clock Front End Project Button Works Only On One Side

Hello Fellow Coders,
I have 2 minor issues with a project I am working on. Frist issue is that 2 of my buttons ("#w-plus") and ("#b-plus) only click handle on their left side and not their right. Another minor issue is that my minus buttons are spaced much further out then the other app elements and margins do not seem to fix the issue. I have attached the codepen link to my project below any help would be greatly appreciated.
Thank You.

if you delete all the css the issue number one is gone, another problem, when you click start several times open several timer and each one is modifying the main-timer, start should open only one timer(interval)