make stickey div in wordpress plugin

 <style>

.kanha {

top: 32px;

}

</style>

<div class="container mt-3">

<!-- welcome message -->

<div class=" sticky-top alert alert-warning kanha" role="alert">

<h4 class="alert-heading"><?php _e('Welcome to','push-notifications-reloaded');?>

<b><?php _e('Push Notifications Reloaded','push-notifications-reloaded');?> </b>

<span>Help</span>

</h4>

<p><?php _e('A simple & easy way to send ','push-notifications-reloaded');?>

<b><?php _e('Push Notifications.','push-notifications-reloaded');?></b>

</p>

</div>

</div>