Alerts

<div class="alert alert-primary" role="alert"> A simple primary alert—check it out! </div> <div class="alert alert-secondary" role="alert"> A simple secondary alert—check it out! </div> <div class="alert alert-success" role="alert"> A simple success alert—check it out! </div> <div class="alert alert-danger" role="alert"> A simple danger alert—check it out! </div>