How to improve this layout?

I did not like it .. You apply'm not using "Row" and "Col"?

Sorry, Look this code:

<div class="row row-center">
        <div class="col">
          <a href="#/tab/pedidoAdd">
            <button class="button button-icon">
              <img class="imagemMenuInicial" src="img/addPedidos.png">
            </button>
          </a>
        </div>
</div>

I applied this example and the same problem occurs ..