class MainWindow extends HTMLElement {
  static observedAttributes = ['title', 'description'];

  constructor() {
    super();
    this.attachShadow({ mode: 'open' });
  }
  
  connectedCallback() {
    this.render();
  }

  attributeChangedCallback() {
    this.render();
  }

  render() {

    this.shadowRoot.innerHTML = `
    <style>
      #window {
        width: 800px;
        height: 477px;
        background: #FFFFFF 0% 0% no-repeat padding-box;
        box-shadow: 0px 5px 12px #0000001F;
        border-radius: 20px;
        opacity: 1;
        padding: 50px;
        display: flex
      }
      h1 {
        height: 49px;
        margin: 0;
        margin-bottom: 13px;
        text-align: center;
        font-size: 40px;
        font-family: "Montserrat", sans-serif;
        font-weight: normal;
        letter-spacing: 0px;
        color: #333333;
        opacity: 1;
      }
      p {
        text-align: center;
        height: 74px;
        margin: 0;
        margin-bottom: 35px;
        text-align: center;
        font-size: 18px;
        font-family: "Montserrat", sans-serif;
        font-weight: normal;
        letter-spacing: 0px;
        color: #333333;
        opacity: 1;
      }
    </style>
    <div id="window">
      <h1>${title}</h1>
      <p>${description}</p>
      <slot></slot>
    </div>
    `;
  }
}

customElements.define('main-window', MainWindow);