SDC - Back to Top button in Drupal theme has lost white border

I have implemented a fix for this on the uikit: https://github.com/civictheme/uikit/pull/620

Verified and tested on latest dev version

Testing Results:
1. Confirmed the white border styling for the 'Back to top' button is present again

Screenshot:

Verified and tested on latest dev version

Testing Results:
1. Confirmed the white border styling for the 'Back to top' button is present again

Screenshot: