Examples
Wrap any text and an optional dismiss button in .alert and one of the four contextual classes (e.g., .alert-success) for basic alert messages.
No default class
Alerts don't have default classes, only base and modifier classes. A default gray alert doesn't make too much sense, so you're required to specify a type via contextual class. Choose from success, info, warning, or danger.
Well done! You successfully read this important alert message.
Heads up! This alert needs your attention, but it's not super important.
Warning! Best check yo self, you're not looking too good.
Oh snap! Change a few things up and try submitting again.
<div class="alert alert-success">...</div>
<div class="alert alert-info">...</div>
<div class="alert alert-warning">...</div>
<div class="alert alert-danger">...</div>
Dismissable alerts
Build on any alert by adding an optional .alert-dismissable and close button.
Warning! Best check yo self, you're not looking too good.
<div class="alert alert-warning alert-dismissable">
<button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
<strong>Warning!</strong> Best check yo self, you're not looking too good.
</div>
Ensure proper behavior across all devices
Be sure to use the <button> element with the data-dismiss="alert" data attribute.
Links in alerts
Use the .alert-link utility class to quickly provide matching colored links within any alert.
<div class="alert alert-success">
<a href="#" class="alert-link">...</a>
</div>
<div class="alert alert-info">
<a href="#" class="alert-link">...</a>
</div>
<div class="alert alert-warning">
<a href="#" class="alert-link">...</a>
</div>
<div class="alert alert-danger">
<a href="#" class="alert-link">...</a>
</div>