<a class='btn primary lg'>large</a>
<a class='btn secondary lg'>large</a>
<a class='btn primary md'>medium</a>
<a class='btn secondary md'>medium</a>
<a class='btn primary sm'>small</a>
<a class='btn secondary sm'>small</a>
<a class='btn primary xs'>extra small</a>
<a class='btn secondary xs'>extra small</a>