<div class="alert alert_primary">
    A simple primary alert—check it out!
</div>
<div class="alert alert_secondary">
    A simple secondary alert—check it out!
</div>
<div class="alert alert_success">
    A simple success alert—check it out!
</div>
<div class="alert alert_danger">
    A simple danger alert—check it out!
</div>
<div class="alert alert_warning">
    A simple warning alert—check it out!
</div>
<div class="alert alert_info">
    A simple info alert—check it out!
</div>
<div class="alert alert_light">
    A simple light alert—check it out!
</div>
<div class="alert alert_dark">
    A simple dark alert—check it out!
</div>