Buttons up to the border


I try to make the buttons goes all the way of the side menu, General, Account, System, etc… but if I do so I lose the far right edge blue line on the border. Like if I mouse hover it becomes blue but not all the way and once selected it is another tint of grey and a little blue line on the right border appears. I want all that to go the entire side menu.

It has been a long time that I am trying to figure out why I can’t do it. Thank You