Apply CSS to Content Page in Asp.NET

In MasterPage <head>
  <asp:contentPlaceholder id="head" runat="server" />
</head>
In ContentPage <asp:content cntentplaceholderid="head" runat="server">
<link rel="stylesheet" href="css/your.css" type="text/css" media="screen" />
</asp:content>

Apply CSS to Content Page in Asp.NET - Stack Overflow