有人可以告诉我为什么我的标题没有显示asp.net C＃

Question

so im trying to set up a header for my div but for some the header wont display the bacground colour:

here is my style code :

   .HeaderClass
         {
             background-color:#26a2b0;
             width :800px;
             height : 150px;
         }

and here is my div code:

 <div class ="Header">
         emu
         <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">


         </asp:ContentPlaceHolder>
     </div>

Answer 1

Your CSS file clearly states that the class name should be HeaderClass , but your HTML uses Header .

Either change your HTML to:

<div class="HeaderClass">
    ...
</div>

, or change your CSS to:

.Header
{
    ...
}