<main>
  <section class="content">
    <h1>Hi! 👋</h1>
    <p>
      Lorem ipsum dolor sit amet consectetur adipisicing elit. Dolor
      perferendis mollitia saepe harum praesentium libero unde reprehenderit
      dolorum inventore veritatis dolorem nostrum, tempora sapiente optio,
      sed maxime consectetur assumenda est.
    </p>
  </section>
</main>

html,
body,
main {
  height: 100%;
  width: 100%;
}

h1 {
  text-align: center;
}

main {
  display: flex;
  align-items: center;
  justify-content: center;
}

.content {
  max-width: 400px;
}