Try this, u will understand..
<table style="width:100%;font-size:10pt;" class="DataTable" id="tbBtn" runat="server" visible="false">
<tr>
<td colspan="2" style="text-align:center">
<asp:Button ID="btnAccept" runat="server" CssClass="Button" OnClick="btnAccept_Click" Text="Accept" Width="60px" />
</td>
</tr>
</table>