The following function provides CSS directly in the footer also of back-end and front-end. Just open your theme functions.php file via FTP or Appearance –> Editor, copy and paste that snippet code in there, and your’re done. It will display the Admin Bar at the bottom of your browser.
That’s it! Now your WordPress Admin Bar has been moved to the bottom of your screen. Of course you can expand the code as you like, for example increasing the padding-top or padding-bottom, whatever… And the second method if you don’t wanna customize your functions.php file is using these plugins like LCT Admin Bar on Bottom, Bottom Admin Bar or Stick Admin Bar To Bottom. All of them are working well!
And the final result will be something like this: