纠结的样式，后面什么也没有，但是就是空出20像素

Question

HTML：
<div style="text-align: center">
            <table width="90%" bgcolor="white" class="tableBorder" cellpadding="0" cellspacing="0" align="center">
               
                <tr>
                    <td style="text-align: center; width: 917px;" align="center">
                    <div style="text-align:center;">
                        <asp:Table ID="Table1" border="1" cellpadding="0" cellspacing="0" runat="server" Width="100%" >
                        <asp:TableHeaderRow><asp:TableHeaderCell ColumnSpan="15">基本信息</asp:TableHeaderCell></asp:TableHeaderRow>
                        <asp:TableRow>
                        <asp:TableCell Width="62">姓名：</asp:TableCell>
                        <asp:TableCell Width="62">
                            <asp:Label ID="username" runat="server" Text="Label"></asp:Label></asp:TableCell>
                        <asp:TableCell Width="62">职工编号：</asp:TableCell>
                        <asp:TableCell Width="62">
                            <asp:Label ID="usernum" runat="server" Text="Label"></asp:Label></asp:TableCell>
                        <asp:TableCell Width="62">出生日期：</asp:TableCell>
                        <asp:TableCell Width="62">
                            <asp:Label ID="userbirthdate" runat="server" Text="Label"></asp:Label></asp:TableCell>
                        <asp:TableCell Width="62">
                            性别：</asp:TableCell>
                        <asp:TableCell Width="62">
                            <asp:Label ID="usersex" runat="server" Text="Label"></asp:Label></asp:TableCell>
                        <asp:TableCell Width="62">民族：</asp:TableCell>
                        <asp:TableCell Width="62">
                            <asp:Label ID="usernation" runat="server" Text="Label"></asp:Label></asp:TableCell>
                        <asp:TableCell Width="62">在册标识：</asp:TableCell>
                        <asp:TableCell Width="62">
                            <asp:Label ID="user" runat="server" Text="Label"></asp:Label></asp:TableCell>
                        <asp:TableCell  Width="62">介绍人：</asp:TableCell>
                        <asp:TableCell Width="62">
                            <asp:Label ID="userintro" runat="server" Text="Label"></asp:Label></asp:TableCell>
                        <asp:TableCell >
                            <asp:Label ID="probationtime" runat="server" Text="Label"></asp:Label>
问题：Table控件后面总是空出“20”像素的距离，无论设置最后这个单元格为多宽，哪怕设置为100，这样Table控件的总宽度超过917，可还是空出20像素的距离。
</asp:TableCell>
                        </asp:TableRow>
           </asp:Table>
                </div>
              
                    </td>
                </tr>
                <tr><td>   导出为:<asp:DropDownList ID="DropDownList1" runat="server" CssClass="buttoncss">
            <asp:ListItem Value="Word">Word文档</asp:ListItem>
            <asp:ListItem Value="Excel">Excel文档</asp:ListItem>
        </asp:DropDownList>
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="导出" CssClass="buttoncss" /></td></tr>
            </table>
        </div>

Answer 1

<div style="text-align:center;">
  <asp:Table ID="Table1" border="1" cellpadding="0" cellspacing="0" runat="server" Width="104%" >
  <asp:TableHeaderRow runat="server"><asp:TableHeaderCell ColumnSpan="15" runat="server">基本信息</asp:TableHeaderCell></asp:TableHeaderRow>
  <asp:TableRow runat="server">
  <asp:TableCell Width="62px" runat="server">姓名：</asp:TableCell>
  <asp:TableCell Width="62px" runat="server">
  <asp:Label ID="username" runat="server" Text="Label"></asp:Label></asp:TableCell>
  <asp:TableCell Width="62px" runat="server">职工编号：</asp:TableCell>
  <asp:TableCell Width="62px" runat="server">
  <asp:Label ID="usernum" runat="server" Text="Label"></asp:Label></asp:TableCell>
  <asp:TableCell Width="62px" runat="server">出生日期：</asp:TableCell>
  <asp:TableCell Width="62px" runat="server">
  <asp:Label ID="userbirthdate" runat="server" Text="Label"></asp:Label></asp:TableCell>
  <asp:TableCell Width="62px" runat="server">
  性别：</asp:TableCell>
  <asp:TableCell Width="62px" runat="server">
  <asp:Label ID="usersex" runat="server" Text="Label"></asp:Label></asp:TableCell>
  <asp:TableCell Width="62px" runat="server">民族：</asp:TableCell>
  <asp:TableCell Width="62px" runat="server">
  <asp:Label ID="usernation" runat="server" Text="Label"></asp:Label></asp:TableCell>
  <asp:TableCell Width="62px" runat="server">在册标识：</asp:TableCell>
  <asp:TableCell Width="62px" runat="server">
  <asp:Label ID="user" runat="server" Text="Label"></asp:Label></asp:TableCell>
  <asp:TableCell Width="62px" runat="server">介绍人：</asp:TableCell>
  <asp:TableCell Width="62px" runat="server">
  <asp:Label ID="userintro" runat="server" Text="Label"></asp:Label></asp:TableCell>
  <asp:TableCell runat="server" >
<asp:Label ID="probationtime" runat="server" Text="Label"></asp:Label>
问题：Table控件后面总是空出“20”像素的距离，无论设置最后这个单元格为多宽，哪怕设置为100，这样Table控件的总宽度超过917，可还是空出20像素的距离。
</asp:TableCell>
  </asp:TableRow>
  </asp:Table>
  </div>
    
  </td>
  </tr>
  <tr><td> 导出为:<asp:DropDownList ID="DropDownList1" runat="server" CssClass="buttoncss">
  <asp:ListItem Value="Word">Word文档</asp:ListItem>
  <asp:ListItem Value="Excel">Excel文档</asp:ListItem>
  </asp:DropDownList>
  <asp:Button ID="Button1" runat="server" Text="导出" CssClass="buttoncss" /></td></tr>
  </table>
  </div>

Answer 2

<table width="90%" bgcolor="white" class="tableBorder" cellpadding="0" cellspacing="0" align="center">
改下table的宽度！
    

Answer 3

改Table的宽度为什么呢？？？这样可以吗？？？