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You can use all the available components of TwitterBootstrap. Here are some of them.
It imports the latest version of Font Awesome. You can use it with
buttons like so:
text-muted to mute text color.
lead to for call-out text.
text-center to center text.
embed-responsive and either
embed-responsive-4by3 classes to make embedded objects responsive.
Autm-rb uses bootstrap-sass, so all of the variables are customizable.