Center vertically and horizontally on the page with CSS Grid

Here’s how you can center this div on a page:

<body>
  <div>center me</div>
</body>

body {
  min-height: 100vh;
  display: grid;
  place-items: center center;
}

These 3 lines of CSS:

Make the body as tall as the device’s screen, so centering something actually looks centered
Indicate that you want to use CSS grid
Place the grid’s one “item” (the div) in the center vertically and the center horizontally