display shutdown msg

static/app.js

@@ -930,6 +930,7 @@ shutdownButton.addEventListener("click", () => {
   fetch("/shutdown", {
     method: "GET",
   });
+  document.getElementById('yooo').style.display = "block";
 });
 
 
@@ -939,6 +940,7 @@ restartButton.addEventListener("click", () => {
   fetch("/restart", {
     method: "GET",
   });
+  document.getElementById('yooo').style.display = "block";
 });
 
 var resetButton = document.getElementById("reset-btn");