The document already has a grid container with one single item.
But this element is stretched to full screen.
Make the item sit in the middle of the grid container, not stretch.
Use the same properties for both vertical and horizontal.

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index.html

<!DOCTYPE html>
<html>
  <head>
    <title>Grid layout</title>
    <style>
      body {
        margin: 0;
      }
      .grid-container {
        display: grid;
        height: 100vh;
        width: 100vw;
      }
      .grid-item {
        background-color: rgb(255, 198, 0);
        padding: 2vw;
        font-size: 10vw;
        font-style: italic;
        font-family: Tahoma;
      }
    </style>
  </head>
  <body>
    <div class="grid-container">
      <div class="grid-item">
        Center Me
      </div>
    </div>
  </body>
</html>