diff -u b/core/themes/bartik/bartik.libraries.yml b/core/themes/bartik/bartik.libraries.yml
--- b/core/themes/bartik/bartik.libraries.yml
+++ b/core/themes/bartik/bartik.libraries.yml
@@ -12,6 +12,7 @@
       css/components/comments.css: {}
       css/components/content.css: {}
       css/components/contextual.css: {}
+      # @see https://www.drupal.org/node/2389735
       css/components/dropbutton.component.css: {}
       css/components/featured.css: {}
       css/components/footer.css: {}
@@ -36,6 +37,7 @@
       css/components/tips.css: {}
       css/components/triptych.css: {}
       css/components/user.css: {}
+      # @see https://www.drupal.org/node/2389735
       css/components/vertical-tabs.component.css: {}
       css/components/views.css: {}
       css/components/buttons.css: {}
diff -u b/core/themes/bartik/css/components/forum.css b/core/themes/bartik/css/components/forum.css
--- b/core/themes/bartik/css/components/forum.css
+++ b/core/themes/bartik/css/components/forum.css
@@ -6 +6 @@
-}
\ No newline at end of file
+}
diff -u b/core/themes/bartik/css/components/vertical-tabs.component.css b/core/themes/bartik/css/components/vertical-tabs.component.css
--- b/core/themes/bartik/css/components/vertical-tabs.component.css
+++ b/core/themes/bartik/css/components/vertical-tabs.component.css
@@ -5 +5 @@
-}
\ No newline at end of file
+}
only in patch2:
unchanged:
--- a/core/themes/bartik/css/style.css
+++ /dev/null
@@ -1,2290 +0,0 @@
-/* ---------- Overall Specifications ---------- */
-
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-  font-size: 87.5%;
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-
-/**
- * The generic monospace font family is listed before Courier new to avoid a
- * a bug in font-size rendering:
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-
-/* --------------- Secondary Menu ------------ */
-
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-/* ------------------- Main ------------------- */
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-
-/* ----------------- Featured ----------------- */
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-
-/* ------------------- Help ------------------- */
-
-.region-help {
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-
-/* ----------------- Content ------------------ */
-
-.content,
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