Added in responsive dropdown toggle to the example so that, in the off chance someone is developing with chrome displayed at less than 768px and has copied the code directly, the user doesn't feel like the sign-in button isn't showing up.
Merge pull request #80 from joujiahe/master

Make 'or' align at center.
Merge pull request #81 from RichardLitt/master

Added in responsive dropdown toggle to the example so that, in the off c...