How to center a div vertically and horizontally using CSS?

Please use following method to align any content vertically and horizontally centered..

<title>Vertical and horizontal center align div</title>
<style>
  .container-box {
    background: #efefef;
    max-width: 1080px;
    min-height: 500px;
  }

  .centered-div {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;     
  }

  .box {
    background: #ccc;
    text-align: center;
    padding: 50px;
  }
</style>
  <div class="container-box centered-div">
    <div class="box">
        This element is horizontally and vertically aligned to center!
    </div>
  </div>