text: import { LitElement, html, customElement } from '@polymer/lit-element';
  import styles from './app.style';
  
  @customElement('main-app')
  class App extends LitElement {
    static get styles() {
      return [styles];
    }
  
    render() {
      return html`
              <main>  
                  <slot>Load app here</slot>
              </main
          `;
    }
  }
  
  export default App;
  