<img align="center" not working HTML

Img Align centre or center not working on HTML website kodeum.co.uk. The error is on line 232

    <div class="container mt">
    <div class="row clients centered">
      <p class="mb">Some clients that I had the pleasure to working for.</p>
      <div class="col-sm-2">
        <img align="centre" src="assets/img/coding-kids.png" alt="Coding Kids">
      </div>
      <div class="col-sm-2">
        <img src="assets/img/flydan.png" alt="flyDan">
      </div>
    </div><!--/row-->
  </div><!--/container-->
</div><!--/.G-->

Can Anyone Help?

Harry