1 . Add CssRewriteUrlTransform() to the StyleBundle and use method chaining for multiple includes. Make sure that the includes without CssRewriteUrlTransform() should come last in the include list.
bundles.Add(new StyleBundle("~/bundles/site1/css").Include(
"~/Content/Tenant/site1/site.css", new CssRewriteUrlTransform()).Include(
"~/Content/font-awesome.min.css", new CssRewriteUrlTransform()).Include(
"~/Content/bootstrap.min.css", new CssRewriteUrlTransform()).Include(
"~/Content/Tenant/site1/sidebar.css",
"~/Content/Tenant/site1/noise/grain.css"));