text: import { LitElement, html, css } from 'lit-element';
  
  export class SuperElement extends LitElement {
    static get styles() {
      return css`
        button { width: 200px; }
      `;
    }
  
    render() {
      return html`
        <button>click</button>
      `;
    }
  }
  
  customElements.define('super-element', SuperElement);
  