<div class="content-center">
  <a><i class="twitter circular inverted positive icon link"></i></a>
  <a><i class="facebook  circular inverted primary icon link"></i></a>
  <a><i class="google circular inverted negative icon link"></i></a>
  <a><i class="pinterest circular inverted secondary icon link"></i></a>
  <a><i class="github circular inverted purple icon link"></i></a>
</div>