demo(app): adjusted the layout ngb-auth-firebaseui's card

Author: AnthonyNahas

demo/src/app/home/home.component.html

@@ -25,8 +25,9 @@ <h1>@firebaseui/ng-bootstrap</h1>
 <section class="home">
   <div class="container">
     <!-- put your content here-->
-    <div class="card">
+    <div class="card mx-auto col-xl-6 col-lg-8 col-sm-10">
       <div class="card-body">
+        <h5 class="card-title">@firebaseui/ng-bootstrap</h5>
         <ngb-auth-firebaseui (onSuccess)="printUser($event)"
                              (onError)="printError($event)">
         </ngb-auth-firebaseui>