app/assets/images/notifications-bell.svg
<svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 20 20"><title>bell</title><path d="M16 7a5.38 5.38 0 0 0-4.46-4.85C11.6 1.46 11.53 0 10 0S8.4 1.46 8.46 2.15A5.38 5.38 0 0 0 4 7v6l-2 2v1h16v-1l-2-2zm-6 13a3 3 0 0 0 3-3H7a3 3 0 0 0 3 3z"/></svg>