Change the way Clean theme's login takes its navbar styles from Bootstrapbase

Select Clean theme TEST to see that the default navbar Username/Login/Logout are the same colour, for link and hover, as the breadcrumb links. GOTO Administration > Appearance > Themes and choose 'Clean' from the list of theme names in the side block navigation. In this settings page click the checkbox to 'Invert Navbar'. Save settings. On saving TEST that the navbar is black and that the Username/Login/Logout link/hover match those of the navbar menu items.