Sticky Back to Top JavaScript using Element ID

back2top.html

<!-- 
Title: Scroll Top
Type: elementor_snippet
Author: Website Admin
Last edited: 2021-04-02 18:07:14
Note: This was added by Elementor, just copy script code below.
Instructions: Add to any site or via Elementor Custom Code feature (Body -> End), 
then use "up" as the id of the trigger element in your design
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 -->
<script type="text/javascript">
	var body = document.body;
	var trigger = document.getElementById('up');
	trigger.addEventListener('click', function( event ){
		event.preventDefault();
		var elementPosition = body.offsetTop;
		window.scrollTo(0, elementPosition);
	}, false);
</script>