l-form-label">Join files:</label>
                        <input type="file" class="form-control" id="join-name" name="join-name" accept="application/pdf"
                               multiple onchange="previewFiles(event)">
                    </div>

                    <div class="modal-footer">
                        <button type="reset" class="btn btn-secondary" data-dismiss="modal">Close</button>
                        <button type="submit" class="btn btn-primary">Send message</button>
           