patternfly/tests/pages/_includes/widgets/communication/toast-danger.html

This reference implementation of PatternFly is based on [Bootstrap v3](http://getbootstrap.com/). Think of PatternFly as a "skinned" version of Bootstrap with additional components and customizations.

<div class="toast-pf alert alert-danger">
  <span class="pficon pficon-error-circle-o"></span>
  Failed to add <strong>server_abc</strong>.
</div>