Add close function for Toasts

app/templates/base.html.j2

@@ -193,8 +193,13 @@
         }
       }
       {% for message in get_flashed_messages() %}
-      M.toast({html: '{{ message }}'})
+      M.toast({"classes": "rounded", "html": '<span>{{ message }}</span><button class="btn-flat toast-action red-text" data-action="close"><i class="material-icons">close</i></button>'});
       {% endfor %}
+      for (toastActionElement of document.querySelectorAll(".toast-action[data-action='close']")) {
+        toastActionElement.addEventListener("click", function(event) {
+          M.Toast.getInstance(toastActionElement.parentElement).dismiss();
+        });
+      }
     </script>
   </body>
 </html>