<style>
    [name="scanPlaceHolder"] {
        width: 100%;
        height: 100%;
        overflow: hidden;
        display: flex;
        justify-content: center;
        align-items: center;
    }
</style>
<script src="https://unpkg.com/html5-qrcode" type="text/javascript"></script>
<script src="https://code.jquery.com/jquery-3.6.2.min.js" integrity="sha256-2krYZKh//PcchRtd+H+VyyQoZ/e3EcrkxhM8ycwASPA=" crossorigin="anonymous"></script>