Class Divider

function buildCard() {
  const cardSection1TextParagraph1 =
      CardService.newTextParagraph().setText('Hello world!');

  const cardSection1Divider1 = CardService.newDivider();

  const cardSection1TextParagraph2 =
      CardService.newTextParagraph().setText('Hello world!');

  const cardSection1 = CardService.newCardSection()
                           .addWidget(cardSection1TextParagraph1)
                           .addWidget(cardSection1Divider1)
                           .addWidget(cardSection1TextParagraph2);

  const card = CardService.newCardBuilder().addSection(cardSection1).build();

  return card;
}