EXAMPLE
Run 
<!DOCTYPE html>
<html>

<head>
	<title>The column-gap property in CSS</title>
	<style type="text/css">
		#flexbox {
		  display: grid;
		  height: 100px;
		  column-gap: 20px;
		}
		
		#flexbox > div {
		  border: 4px solid deeppink;
		  background-color: skyblue;
		  flex: grid;
		}
	</style>
</head>

<body>
	<div id="flexbox">
		<div></div>
		<div></div>
		<div></div>
	</div>
</body>

</html>