asp.net - 不重复显示背景图像

Question

我试图在 ValidationSummary div 中放置一个小图标(在元素符号列表的左侧)。图像显示，但在我使用时重复:

background:url(Images/exclamation.png);

图像根本不显示，当我说:

background:url(Images/exclamation.png) no-repeat 12px 30px;

我在这里错过了什么。

CSS:

 .validationsummary
  {
   background:url(Images/exclamation.png) no-repeat 12px 30px;
   border:1px solid #b08b38;
   width:99%;    
  }
 .validationsummary ul
 {  
  color:#982b12;
  background-color:PeachPuff;
 }
.validationsummary ul li
 {
 padding:2px 0px 0px 15px; 
 font-size:12px;   
 }

ASPX:

<table width="100%">
 <tr>
  <td width="100%">
   <asp:ValidationSummary ID="vs" runat="server" CssClass="validationsummary" 
    DisplayMode="BulletList" />
  </td>
 </tr>
</table>

<table width="100%" cellspacing="10px">        
 <tr>
  <td width="11%" align="left">
   * Surname
  </td>
  <td width="18%" align="left">
   <asp:TextBox ID="txtSurname" runat="server" Width="93%"></asp:TextBox>
    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"  
     ControlToValidate="txtSurname" SetFocusOnError="true" Text="*" ForeColor="Red"  
     Display="Dynamic" ErrorMessage="Surname Is Required"></asp:RequiredFieldValidator>
  </td>
 </tr>
</table>

Answer 1

尝试

.validationsummary
{
   background:url(Images/exclamation.png) no-repeat 0 0;
   border:1px solid #b08b38;
   width:99%;    
}

如果有效，请相应地放置您的背景。