Center vertical and horizontal

#css

Simple way to align items in the center of a div.

<html>
  <head>
    <style>
      html, body {
        height: 100%;
        width: 100%;
        margin: 0;
        font-family: Helvetica, "Helvetica Neue", sans-serif;
      }

      .container {
        height: 100%;
        width: 100%;
        display: grid;
        place-items: center;
      }

      .content {
        padding: 30px;
        border: solid 1px #00a0ff;
        border-radius: 5px;
        width: 300px;
        text-align: center;
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="content">
        Hello World!!!
      </div>
    </div>
  </body>
</html>