সিএসএস place-items

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.container {
  height: 180px;
  width: 180px;
  border: solid black 1px;
  display: grid;
  grid-template-columns: repeat(3, 50px);
  grid-template-rows: repeat(2, 50px);
  place-items: center;
}

.container > div {
  height: 30px;
  width: 30px;
  background-color: coral;
}
</style>
</head>
<body>

<div class="container">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
</div>

</body>
</html>