DataPicker Dates go outside the dialog

DataPicker Dates go outside the dialog

<script src="http://code.jquery.com/jquery-1.8.2.js" type="text/javascript"></script>
    <script src="Scripts/jquery.tooltip.min.js" type="text/javascript"></script>
    <script src="Scripts/Tooltip.js" type="text/javascript"></script>
    <link rel="stylesheet" href="//code.jquery.com/ui/1.8.2/themes/start/jquery-ui.css" />
    <script src="//code.jquery.com/ui/1.8.2/jquery-ui.js" type="text/javascript"></script>

<script>
            $(function () {
                $(".date").datepicker();
                $(".date").css('fontSize', '9px!important');
            });
        });
    </script>



-----------------------------------------------------ASP CODE------------------------------------------------------
   <asp:TextBox ID="txtStartDate" runat="server" CssClass="date" ValidationGroup="Validate"></asp:TextBox>