Styling

Each toast's host element gets a base ngx-toast class plus a type modifier (ngx-toast--success / -info / -warning / -error) and a state modifier (ngx-toast--opening / -open / -closing). Override the type classes to customize colors:

.ngx-toast--success {
  background-color: green !important;
}
.ngx-toast--error {
  background-color: pink !important;
}

The open/close CSS transition duration is controlled by the animationDuration option (default 200ms) and is applied via an inline transition-duration style, so it stays in sync with the timer that removes the toast from the DOM.