Add some dogfooding

website/_dogfooding/dogfooding.css

@@ -0,0 +1,22 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+html.plugin-docs.plugin-id-docs-tests .red > a {
+  color: red;
+}
+
+html.plugin-docs.plugin-id-docs-tests .navbar {
+  border-bottom: solid thin cyan;
+}
+
+html.plugin-blog.plugin-id-blog-tests .navbar {
+  border-bottom: solid thin lime;
+}
+
+html.plugin-pages.plugin-id-pages-tests .navbar {
+  border-bottom: solid thin yellow;
+}

website/docusaurus.config.js

@@ -320,7 +320,10 @@ const config = {
           remarkPlugins: [npm2yarn],
         },
         theme: {
-          customCss: [require.resolve('./src/css/custom.css')],
+          customCss: [
+            require.resolve('./src/css/custom.css'),
+            require.resolve('./_dogfooding/dogfooding.css'),
+          ],
         },
         gtag: !isDeployPreview
           ? {

website/src/css/custom.css

@@ -166,10 +166,6 @@ div[class^='announcementBar_'] {
   font-weight: bold;
 }
 
-.red > a {
-  color: red;
-}
-
 .screen-reader-only {
   border: 0;
   clip: rect(0 0 0 0);