Untitled

...
bundles.Add(new StyleBundle("~/Content/css").Include(
             "~/Content/Index.css",
             "~/Content/Layout.css",
             "~/Content/Login.css"
             ));

@{
  ViewBag.Title = "Index";
  Layout = "../Shared/_Layout.cshtml";
 }
<head>
    <link href="@Url.Content("~/Content/Index.css")" rel="stylesheet" type="text/css" />
</head>