Add margin-left to the notification button
Add margin-left to the notification button

Addresses #3939

Auditors: @ayumi

Test Plan:

1. Go to https://trac.torproject.org/projects/tor
2. Log in with your username and password
3. Change the window size

jonathansampson/browser-laptop,Sh1d0w/browser-laptop,Sh1d0w/browser-laptop,darkdh/browser-laptop,luixxiul/browser-laptop,jonathansampson/browser-laptop,willy-b/browser-laptop,MKuenzi/browser-laptop,darkdh/browser-laptop,pmkary/braver,dcposch/browser-laptop,timborden/browser-laptop,darkdh/browser-laptop,diasdavid/browser-laptop,MKuenzi/browser-laptop,darkdh/browser-laptop,diasdavid/browser-laptop,MKuenzi/browser-laptop,timborden/browser-laptop,willy-b/browser-laptop,dcposch/browser-laptop,dcposch/browser-laptop,jonathansampson/browser-laptop,Sh1d0w/browser-laptop,luixxiul/browser-laptop,luixxiul/browser-laptop,Sh1d0w/browser-laptop,luixxiul/browser-laptop,timborden/browser-laptop,diasdavid/browser-laptop,diasdavid/browser-laptop,willy-b/browser-laptop,pmkary/braver,willy-b/browser-laptop,pmkary/braver,timborden/browser-laptop,pmkary/braver,jonathansampson/browser-laptop,MKuenzi/browser-laptop,dcposch/browser-laptop