Added autohide with animation for flash message

app/views/layouts/_flash.html.erb

@@ -0,0 +1,37 @@
+<% flash.each do |type, message| %>
+  <%
+    bg_color = type == "notice" ? "bg-green-50 border-green-200 text-green-800" : "bg-red-50 border-red-200 text-red-800"
+    icon_color = type == "notice" ? "text-green-500" : "text-red-500"
+    # Die Farbe des Balkens passend zum Typ festlegen
+    bar_color = type == "notice" ? "bg-green-500" : "bg-red-500"
+  %>
+
+  <div data-controller="flash" class="fixed top-5 right-5 z-50 max-w-sm w-full">
+
+    <!-- Das relative Attribut und overflow-hidden sind wichtig für den Balken -->
+    <div data-flash-target="notification"
+         class="relative overflow-hidden transition-all duration-300 ease-out opacity-100 flex items-start p-4 pb-5 rounded-lg border shadow-lg <%= bg_color %>">
+
+      <!-- Nachricht -->
+      <div class="flex-1 ml-3 text-sm font-medium">
+        <%= message %>
+      </div>
+
+      <!-- Schließen-Button -->
+      <div class="ml-4 flex shrink-0">
+        <button data-action="click->flash#dismiss"
+                class="inline-flex rounded-md p-1.5 focus:outline-none focus:ring-2 focus:ring-offset-2 hover:bg-black/5 <%= icon_color %>">
+          <span class="sr-only">Schließen</span>
+          <svg class="h-5 w-5" viewBox="0 0 20 20" fill="currentColor">
+            <path fill-rule="evenodd" d="M4.293 4.293a1 1 0 011.414 0L10 8.586l4.293-4.293a1 1 0 111.414 1.414L11.414 10l4.293 4.293a1 1 0 01-1.414 1.414L10 11.414l-4.293 4.293a1 1 0 01-1.414-1.414L8.586 10 4.293 5.707a1 1 0 010-1.414z" clip-rule="evenodd"/>
+          </svg>
+        </button>
+      </div>
+
+      <!-- DER FORTSCHRITTSBALKEN -->
+      <!-- 'animate-shrink' ist unsere eigene Animation, die wir gleich definieren -->
+      <div class="absolute bottom-0 left-0 h-1 w-full origin-left animate-shrink <%= bar_color %>"></div>
+
+    </div>
+  </div>
+<% end %>