Notification border in control panel

[nishiiko]

I have once again come to ask about css that I can't find 🙏
Where can I find the css responsible for this blue border?

[nishiiko]

Got it!

.notification-group {
  /* Styling only for Grouped Notifications */
  transition: opacity 200ms ease-in-out;
  outline: transparent;
  /* The groups close button */
}

.notification-group:focus {
  background: var(--noti-bg-focus);
  outline: transparent;
}