Examples
Default styling
.btn-primary
Primary / Default
.btn-secondary
Secondary
.btn-tertiary
Tertiary
.btn-primary.active
Primary active state
.btn-secondary.active
Secondary active state
.btn-tertiary.active
Tertiary active state
.btn-primary.disabled
Primary disabled state
.btn-secondary.disabled
Secondary disabled state
.btn-tertiary.disabled
Tertiary disabled state
Markup
<button class="btn [modifier class]">Button Element</button>
<input class="btn [modifier class]" type="button" value="Input Button" />
Source:
components/_button.scss, line 145