xxxxxxxxxx
<p>Envelope icon: <span class="glyphicon glyphicon-envelope"></span></p>
xxxxxxxxxx
<span class="glyphicon glyphicon-search" aria-hidden="true"></span>
xxxxxxxxxx
<div class="alert alert-danger" role="alert">
<span class="input-group-text aria-hidden="true"></span>
<span class="sr-only">Error:</span>
Enter a valid email address
</div>