viewDiv.style.cursor = "default";
document.getElementById("viewDiv").style.cursor = "default";
If that doesn't work you could try using jQuery
$('#viewDiv').css( 'cursor', 'default' );
<script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
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