reverted:
--- b/core/modules/node/css/node.admin.theme.css
+++ /dev/null
@@ -1,93 +0,0 @@
-/**
- * @file
- * Styles for node administration.
- */
-
-/**
- * Node add/edit form layout.
- */
-
-/* Narrow screens */
-.layout-region {
-  box-sizing: border-box;
-}
-
-/* Wide screens */
-@media screen and (min-width: 780px), (orientation: landscape) and (min-device-height: 780px) {
-  .layout-region-node-main,
-  .layout-region-node-footer {
-    float: left; /* LTR */
-    width: 65%;
-    padding-right: 2em; /* LTR */
-  }
-
-  [dir="rtl"] .layout-region-node-main,
-  [dir="rtl"] .layout-region-node-footer {
-    float: right;
-    padding-left: 2em;
-    padding-right: 0;
-  }
-
-  .layout-region-node-secondary {
-    float: right; /* LTR */
-    width: 35%;
-  }
-
-  [dir="rtl"] .layout-region-node-secondary {
-    float: left;
-  }
-
-  /* @todo File an issue to add a standard class to all text-like inputs */
-  .layout-region-node-secondary .form-autocomplete,
-  .layout-region-node-secondary .form-text,
-  .layout-region-node-secondary .form-tel,
-  .layout-region-node-secondary .form-email,
-  .layout-region-node-secondary .form-url,
-  .layout-region-node-secondary .form-search,
-  .layout-region-node-secondary .form-number,
-  .layout-region-node-secondary .form-color,
-  .layout-region-node-secondary textarea {
-    box-sizing: border-box;
-    width: 100%;
-    max-width: 100%;
-  }
-}
-
-/**
- * The vertical toolbar mode gets triggered for narrow screens, which throws off
- * the intent of media queries written for the viewport width. When the vertical
- * toolbar is on, we need to suppress layout for the original media width + the
- * toolbar width (240px). In this case, 240px + 780px.
- */
-@media screen and (max-width: 1020px) {
-  .toolbar-vertical.toolbar-tray-open .layout-region-node-main,
-  .toolbar-vertical.toolbar-tray-open .layout-region-node-footer,
-  .toolbar-vertical.toolbar-tray-open .layout-region-node-secondary {
-    float: none;
-    width: auto;
-    padding-right: 0;
-  }
-}
-
-/* Node preview container. */
-.node-preview-container {
-  position: fixed;
-  z-index: 499;
-  width: 100%;
-  padding: 10px;
-}
-
-@media only screen and (min-width: 36em) {
-  .node-preview-container .form-type-select {
-    margin-left: 25%; /* LTR */
-  }
-  [dir="rtl"] .node-preview-container .form-type-select {
-    margin-right: 25%;
-    margin-left: 0;
-  }
-}
-
-/* Revision color. */
-.revision-current {
-  background: #ffc;
-}
only in patch2:
unchanged:
--- a/core/modules/node/css/node.module.css
+++ b/core/modules/node/css/node.admin.theme.css
@@ -1,22 +1,19 @@
 /**
  * @file
- * Styles for administration pages.
+ * Styles for node administration.
  */
 
 /**
- * Node add/edit form layout
+ * Node add/edit form layout.
  */
 
 /* Narrow screens */
 .layout-region {
-  box-sizing:         border-box;
+  box-sizing: border-box;
 }
 
 /* Wide screens */
-@media
-  screen and (min-width: 780px),
-  (orientation: landscape) and (min-device-height: 780px) {
-
+@media screen and (min-width: 780px), (orientation: landscape) and (min-device-height: 780px) {
   .layout-region-node-main,
   .layout-region-node-footer {
     float: left; /* LTR */
@@ -50,7 +47,7 @@
   .layout-region-node-secondary .form-number,
   .layout-region-node-secondary .form-color,
   .layout-region-node-secondary textarea {
-    box-sizing:         border-box;
+    box-sizing: border-box;
     width: 100%;
     max-width: 100%;
   }
@@ -62,9 +59,7 @@
  * toolbar is on, we need to suppress layout for the original media width + the
  * toolbar width (240px). In this case, 240px + 780px.
  */
-@media
-  screen and (max-width: 1020px) {
-
+@media screen and (max-width: 1020px) {
   .toolbar-vertical.toolbar-tray-open .layout-region-node-main,
   .toolbar-vertical.toolbar-tray-open .layout-region-node-footer,
   .toolbar-vertical.toolbar-tray-open .layout-region-node-secondary {
@@ -73,3 +68,26 @@
     padding-right: 0;
   }
 }
+
+/* Node preview container. */
+.node-preview-container {
+  position: fixed;
+  z-index: 499;
+  width: 100%;
+  padding: 10px;
+}
+
+@media only screen and (min-width: 36em) {
+  .node-preview-container .form-type-select {
+    margin-left: 25%; /* LTR */
+  }
+  [dir="rtl"] .node-preview-container .form-type-select {
+    margin-right: 25%;
+    margin-left: 0;
+  }
+}
+
+/* Revision color. */
+.revision-current {
+  background: #ffc;
+}