CSS判断浏览器

 

<span style="border:1px solid green; display:block; width:95px; height:17px; overflow:hidden;">  
        <asp:DropDownList ID="ddlclassshowDel" runat="server" style="margin:-2px;"  AutoPostBack="True"    AppendDataBoundItems="True" OnSelectedIndexChanged="ddlclassshowDel_SelectedIndexChanged">
             <asp:ListItem Text="-请选择类别-" Value="-1"></asp:ListItem>
       </asp:DropDownList></span

<span style="border:1px solid green; display:block; width:98px; height:98px; verflow:hidden;">                                

         <asp:ListBox ID="lbxClassName" runat="server"  style="margin:-3px -2px -2px -3px;"  Width="105px" Height="120px"></asp:ListBox>
        </span>