add Style the selected hero

src/app/heroes/heroes.component.html

@@ -1,16 +1,18 @@
-<!--h2>{{hero.name | uppercase}} Details</h2>
-<div><span>id: </span>{{hero.id}}</div>
-<div>
-  <label for="name">Hero name: </label>
-  <input id="name" [(ngModel)]="hero.name" placeholder="name">
-</div-->
-
 <h2>My Heroes</h2>
 <ul class="heroes">
   <li *ngFor="let hero of heroes">
-    <button type="button">
+    <button type="button" (click)="onSelect(hero)" [class.selected]="hero === selectedHero">
       <span class="badge">{{hero.id}}</span>
       <span class="name">{{hero.name}}</span>
     </button>
   </li>
-</ul>
+</ul>
+
+<div *ngIf="selectedHero">
+  <h2>{{selectedHero.name | uppercase}} Details</h2>
+  <div>id: {{selectedHero.id}}</div>
+  <div>
+    <label for="hero-name">Hero name: </label>
+    <input id="hero-name" [(ngModel)]="selectedHero.name" placeholder="name">
+  </div>
+</div>