Hide (Disable) Button when printing in JavaScript

<div>
    <script type="text/javascript">
        function PrintWindow() {
            var btnPrint = document.getElementById("btnPrint");
            btnPrint.style.visibility = 'hidden';
            window.print()
            btnPrint.style.visibility = 'visible';
        }
    </script>
    <input id="btnPrint" type="button" value="Print" onclick="PrintWindow()" />
    <div id="dvContents">
        <div class="left">
            <img alt="" src="https://i.imgur.com/73e8Dja.png" />
        </div>
        <div class="right">
            <span class="label">ASPSnippets.com Sample page</span>
        </div>
        <div class="clear">
        </div>
        <hr />
        <div class="contents">
            <span class="label">Hello,
                <br />
                This is <span class="name">Mudassar Khan</span>.<br />
                Hoping that you are enjoying my articles!</span>
        </div>
    </div>
</div>