<button type="button" class="button-default">Button</button>
<a href="javascript:;" class="button button-default">Anchor Button</a>
<a href="javascript:;" class="button button-primary">Primary</a>
<a href="javascript:;" class="button button-secondary">Secondary</a>
<a href="javascript:;" class="button button-tertiary">Tertiary</a>
<a href="javascript:;" class="button button-clear">Clear</a>