I use angular-notifier package in my angular 7 project. I added its selector in app.component.html before router-outlet. I add its config in app.module.ts in imports. I can not chane some style in it. for example add an icon, or change \n to next line, etc
try to use mdbootsatap package
<div class="toast" role="alert" aria-live="assertive" aria-atomic="true">
<div class="toast-header">
<svg class=" rounded mr-2" width="20" height="20" xmlns="http://www.w3.org/2000/svg" preserveAspectRatio="xMidYMid slice"
focusable="false" role="img">
<rect fill="#007aff" width="100%" height="100%" /></svg>
<strong class="mr-auto">Bootstrap</strong>
<small class="text-muted">11 mins ago</small>
<button type="button" class="ml-2 mb-1 close" data-dismiss="toast" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="toast-body">
Hello, world! This is a toast message.
</div>
</div>