add css for browser popup err messages

browser/src/css/main.css

@@ -64,3 +64,9 @@
   margin: .5em;
   border-radius: .5em;
 }
+
+.error {
+  background-color: #d33682;
+  color: #eee8d5;
+  border-radius: .5em;
+}

browser/src/js/UI.js

@@ -90,6 +90,8 @@ export default class UI {
               return true
             } else {
               console.log("login fail")
+              error('Please try to log in again.')
+              return false
             }
           }
         )

package.json

@@ -33,7 +33,7 @@
     "react-youtube": "^7.5.0",
     "sass-loader": "^6.0.6",
     "style-loader": "^0.20.1",
-    "webpack": "^3.0.0",
+    "webpack": "^4.8.3",
     "webpack-bundle-tracker": "0.2.1"
   }
 }