Update app-root demo

Author: jbuckner

demo/app-root.ts

@@ -1,21 +1,13 @@
-import { html, css, LitElement, customElement } from 'lit-element';
+import { html, LitElement, customElement } from 'lit-element';
 import '../src/your-webcomponent';
 
 @customElement('app-root')
 export class AppRoot extends LitElement {
   render() {
     return html`
       <your-webcomponent title="Hello">
-        <div slot="my-slot">Some LightDOM Content</div>
+        <div slot="my-slot">Some slotted content</div>
       </your-webcomponent>
     `;
   }
-
-  static styles = css`
-    :host {
-      display: block;
-      padding: 25px;
-      color: var(--your-webcomponent-text-color, #000);
-    }
-  `;
 }