Brand Buttons Usage ex. <button class="btn btn-brand btn-facebook">Facebook</button>
Size Small Add this class .btn-sm

Size Normal

Size Large Add this class .btn-lg

Brand Buttons Only icons. Usage ex. <button class="btn btn-brand btn-facebook"><i class="fa fa-facebook"/></button>
Size Small Add this class .btn-sm

Size Normal

Size Large Add this class .btn-lg

Brand Buttons Only text. Usage ex. <button class="btn btn-brand btn-facebook text">Facebook</button>
Size Small Add this class .btn-sm

Size Normal

Size Large Add this class .btn-lg