HTML

notyf

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/notyf@3/notyf.min.css">
<script src="https://cdn.jsdelivr.net/npm/notyf@3/notyf.min.js"></script>
<script>
var notyf = new Notyf(); // Create an instance of Notyf
notyf.error('You must fill out the form before moving forward'); // error
notyf.success('Your changes have been successfully saved!'); // success
</script>