<button type="button" class="btn btn-ar btn-sm btn-default">Default</button>
<button type="button" class="btn btn-ar btn-default">Default</button>
<button type="button" class="btn btn-ar btn-lg btn-default">Default</button>
                            

<button type="button" class="btn btn-block btn-ar btn-default">Default</button>
<button type="button" class="btn btn-block btn-ar btn-primary">Primary</button>
<button type="button" class="btn btn-block btn-ar btn-success">Success</button>
<button type="button" class="btn btn-block btn-ar btn-info">Info</button>
<button type="button" class="btn btn-block btn-ar btn-warning">Warning</button>
<button type="button" class="btn btn-block btn-ar btn-danger">Danger</button>
<button type="button" class="btn btn-block btn-ar btn-royal">Royal</button>