Modifiers: .label-default, .label-primary, .label-secondary, .label-success, .label-info, .label-danger, .label-warning
.label-default
.label-primary
.label-secondary
.label-success
.label-info
.label-danger
.label-warning
Modifier: .label-pill
.label-pill
Modifier: font-size inherit from parent element
Element: .btn
.btn