Demo page:
https://demo.drupar.com/mahi/elements/message-box
Success Message
<div class="message message-status">
<p>This is a sample success message.</p>
</div>Error Message
<div class="message message-error">
<p>This is a sample error message.</p>
</div>Warning Message
<div class="message message-warning">
<p>This is a sample warning message.</p>
</div>