To set the gap between columns, use the columnGap property.
Example
You can try to run the following code to learn how to set the gap between columns with JavaScript −
<!DOCTYPE html>
<html>
<body>
<p>Click below to create 4 columns and set gap of 30px</p>
<button onclick="display()">Columns</button>
<div id="myID">
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</div>
<script>
function display() {
document.getElementById("myID").style.columnCount = "4";
document.getElementById("myID").style.columnGap = "30px";
}
</script>
</body>
</html>