W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style>
.grid-container {
  display: grid;
  grid-template: auto / auto auto auto auto;
  grid-gap: 10px;
  background-color: #2196F3;
  padding: 10px;
}

.grid-container > div {
  background-color: rgba(255, 255, 255, 0.8);
  text-align: center;
  padding: 20px 0;
  font-size: 30px;
}
</style>
</head>
<body>

<h1>Change the grid-template Property with JavaScript</h1>

<p>Click the button to change the grid layout from a four columns layout to a two columns layout, where the first row is 250px high:</p>
<p><button onclick="myFunction()">Change layout</button></p>

</body>
</html>