Note : Test on Boost and Clean. Check only the buttons, ignore any bad layout in the modals. These will be addressed in MDL-62746 . Go to Site Administration → Appearance → Manage tags. Click "Add tag collection". Confirm the buttons are styled consistently with the Bootstrap buttons (For Boost, check this out. For Clean, check this out. Cancel. Click "Default collection". Click "Add standard tags". Confirm the buttons are styled consistently with the Bootstrap buttons (For Boost, check this out. For Clean, check this out. Enter into the field 'Tag 1, Tag 2'. Click 'Continue'. Click the checkboxes of the two just inserted labels. Click "Combine selected". Confirm the buttons are styled consistently with the Bootstrap buttons (For Boost, check this out. For Clean, check this out.