Thank you. It worked for me. Even the ‘Share link’ is now better than before (It is closer to the button).
I really appropriate your help. 
I just want to ask you something. Do you have a problem when you customize your admin interface? You see there is no admin_rtl.scss in the code base (there is for desktop and mobile). So when I try to customize any thing in my admin interface, It only works if I am browsing the interface coming from my desktop interface. I mean, if you refresh the page the customization is gone. If you go directly to the admin interface, the customization is gone.