W3Schools Tryit Editor

<!DOCTYPE html>
<html>
<head>
<style>
.grid-container {
  display: grid;
  grid-template-columns: auto auto auto auto;
  grid-column-gap: 50px;
  grid-row-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>The grid-column-gap Property</h1>

<p>Use the <em>grid-column-gap</em> property to specify the size of the gap between the columns.</p>
<p>This grid has a 50px gap between columns (and a 10px gap between rows):</p>

</body>
</html>