<html>
<head>
<style>
  button {
    width:  100px;
    height: 100px;
    border: 0;
    margin: 10px;
  }
  button.icon-red { background: url('resources/fragment-identifiers.svg#red'); }
  button.icon-green { background: url('resources/fragment-identifiers.svg#green'); }
  button.icon-blue { background: url('resources/fragment-identifiers.svg#blue'); }
</style>
<body>
  <button class="icon-red"></button>
  <button class="icon-green"></button>
  <button class="icon-blue"></button>
</body>
</html>