<a class="gmr-btn" href="#">Hello 1</a>
<a class="gmr-btn gmr-btn-red" href="#">Hello 2</a>
<a class="gmr-btn gmr-btn-green" href="#">Hello 3</a>
<a class="gmr-btn gmr-btn-yellow" href="#">Hello 4</a>
<a class="gmr-btn gmr-btn-yellow gmr-btn-block" href="#">Example Button Block</a>