<button class="btn btn-primary" type="button" data-toggle="modal" data-target="#stamps_to_approve" id="open_stamps_to_approve" style="display:none"></button>
<div class="modal fade" id="stamps_to_approve" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
    <div class="modal-dialog modal-lg" role="document" style="max-width:70%">
        <div class="modal-content" id="stamps_to_approve_content">

        </div>
    </div>
</div>