CodePen Embed - block

<main>
  <div class="center">
    Центрируемый блочный эленмент.
  </div>
</main>

main {
  margin: 50px;
}

.center {
  width: 260px;
  margin: 0 auto;
  background-color: #74BAAC;
  padding: 10px;
}

This Pen is owned by Vladimir on CodePen.

This Pen doesn't use any external CSS resources.

This Pen doesn't use any external JavaScript resources.