text: import { LitElement, html } from 'lit-element';
  
  const perClassStyle = html`
    <style>
      :host {
        display: block;
        font-family: Roboto;
        font-size: 14px; 
      }
    </style>
  `;
  
  const blueText = html`
    <style> :host { color: blue; } </style>
  `;
  
  const redText = html`
    <style> :host { color: red; } </style>
  `;
  
  class MyElement extends LitElement {
    constructor() {
      super();
      this.perInstanceStyle = redText;
    }
    render() {
      return html`
        ${perClassStyle}
        ${this.perInstanceStyle}
        <div>Hello World</div>
      `;
    }
  }
  
  customElements.define('my-element', MyElement);
  