Color Variations
.btn-default
.btn-dark
.btn-primary
.btn-success
.btn-info
.btn-warning
.btn-danger
.btn-alert
.btn-system
Button States
.disabled
.btn-hover
.active
Button Sizes
.btn-xs
.btn-sm
Normal button
.btn-lg
Button Options
.btn-rounded
.btn-gradient
.btn-bordered
Icon/Button Groups
Multiple .btns wrapped in .btn-group .btn-group-number
Button Dropdowns
.dropdown-toggle
Loading Buttons
.ladda-button