How to access iframe content inside modal popup?

<div>
    <div class="modal fade" id="modalRptQuote" role="dialog">
        <div class="modal-dialog modal-lg">
            <div class="modal-content font-white">
                <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal">&times;</button>
                    <h4 class="modal-title">Quote</h4>
                </div>
                <div class="modal-body">
                    <div class="row">
                        <div class="col-md-12">
                            <div> 
                                <iframe id="rptRWindow" title="rptWindow" aria-label="rptWindow" aria-labelledby="rptWindow"
                                        src="https://localhost:58245/Views/Reports/rptQuote.aspx" frameborder="0"
                                        width="500" height="500" style="overflow:hidden;" scrolling="yes"></iframe>
                            </div>
                        </div>
                    </div>
                </div>
                <div class="modal-footer">
                    <!--<button type="button" class="btn btn-default" data-dismiss="modal">Close</button>-->
                </div>
            </div>
        </div>
    </div>
    <button type="button" id="btnHideRptQuote" data-modal="http://localhost:58245/Views/Reports/rptQuote.aspx" href="#modalRptQuote" data-toggle="modal" class="btn code-dialog hidden"></button>
</div>
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