ul.list-btn
  li: button(type="button" class="btn btn--default") Default
  li: button(type="button" class="btn btn--primary") Primary
  li: button(type="button" class="btn btn--success") Danger
  li: button(type="button" class="btn btn--danger") Danger
  li: button(type="button" class="btn btn--info") Info
  li: button(type="button" class="btn btn--warning") warning
  li: button(type="button" class="btn btn--dark") Dark