Temp. Fix: mbz-cards didnt get a fixed (max) width on small screens

- Add a max-width and width for mbz-card in App.vue

js/src/App.vue

@@ -322,6 +322,11 @@ onBeforeUnmount(() => {
   }
 }
 
+.w-full .mbz-card {
+  width: 20rem;
+  max-width: 95%;
+}
+
 .vue-skip-to {
   z-index: 40;
 }