Comment 22 for bug 1818770

I tried fixing the issue in-browser and think that this should work.

Update from line 135 of static/themes/ubuntu/_styles.scss:

'''
#splash {
  background: url("/static/themes/ubuntu/img/image-background-pattern.png");
  position: absolute;
  width: 100vw;

  .login {
'''

(note: this also removes a gradient from the background which wouldn't have been on the original design. If it's desired then don't remove that line and just add the "position" and "width" lines)