asp menu居中

<div>
<center>
<asp:Menu ID="Menu1" runat="server" BackColor="#F7F6F3" DynamicHorizontalOffset="2" Font-Names="Verdana" Font-Size="1em" ForeColor="#7C6F57" Orientation="Horizontal" StaticSubMenuIndent="10px" RenderingMode="Table">
<DynamicHoverStyle BackColor="#7C6F57" ForeColor="White" />
<DynamicMenuItemStyle HorizontalPadding="5px" VerticalPadding="2px" />
<DynamicMenuStyle BackColor="#F7F6F3" />
<DynamicSelectedStyle BackColor="#5D7B9D" />

<Items>
<asp:MenuItem Text="首页" Value="首页"></asp:MenuItem>
<asp:MenuItem Text="图书管理" Value="图书管理"></asp:MenuItem>
<asp:MenuItem Text="读者管理" Value="读者管理"></asp:MenuItem>
<asp:MenuItem Text="借还书" Value="借还书"></asp:MenuItem>
<asp:MenuItem Text="查询" Value="查询"></asp:MenuItem>
</Items>

<StaticHoverStyle BackColor="#7C6F57" ForeColor="White" />
<StaticMenuItemStyle HorizontalPadding="100px" VerticalPadding="5px" />
<StaticSelectedStyle BackColor="#5D7B9D" />
</asp:Menu>
<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">

</asp:ContentPlaceHolder>
</center>
</div>