this is not working :/

[j-Cis]

I did everything according to the instructions, and localhost: 4300 returns the text "Accepted", I also opened this page in the new tab "https://angular-gui.firebaseapp.com/" and I have no idea how to revive it - this is not working? please help...

I use: Visual Sudio Code: 1.20 &&

Angular CLI: 1.6.4
Node: 9.4.0
OS: win32 x64
Angular: 5.2.1
... animations, bazel, common, compiler, compiler-cli, core
... forms, http, language-service, platform-browser
... platform-browser-dynamic, platform-server
... platform-webworker, platform-webworker-dynamic, router
... service-worker

@angular/cdk: 5.1.0
@angular/cli: 1.6.4
@angular/material: 5.1.0
@angular-devkit/build-optimizer: 0.0.38
@angular-devkit/core: 0.0.25
@angular-devkit/schematics: 0.0.48
@ngtools/json-schema: 1.1.0
@ngtools/webpack: 1.9.4
@schematics/angular: 0.1.13
@schematics/schematics: 0.0.13
typescript: 2.5.3
webpack: 3.10.0

&& Google Chrome : Wersja 63.0.3239.132