diff --git a/core/modules/system/css/system.diff.css b/core/modules/system/css/system.diff.css
index 1c73598..251ff57 100644
--- a/core/modules/system/css/system.diff.css
+++ b/core/modules/system/css/system.diff.css
@@ -5,23 +5,39 @@
   padding:4px;
   border:1px solid #ddd;
   background:#fff;
-  margin:0px 0px 10px;
+  margin:0 0 10px;
 }
 
-.diff-inline-legend { font-size:11px; }
+.diff-inline-legend {
+  font-size:11px;
+}
 
 .diff-inline-legend span,
-.diff-inline-legend label { margin-right:5px; }
+.diff-inline-legend label {
+  margin-right:5px;
+}
 
 /**
  * Inline diff markup
  */
-span.diff-deleted { color:#ccc; }
-span.diff-deleted img { border: solid 2px #ccc; }
-span.diff-changed { background:#ffb; }
-span.diff-changed img { border:solid 2px #ffb; }
-span.diff-added { background:#cfc; }
-span.diff-added img { border: solid 2px #cfc; }
+span.diff-deleted {
+  color:#ccc;
+}
+span.diff-deleted img {
+  border: solid 2px #ccc;
+}
+span.diff-changed {
+  background:#ffb;
+}
+span.diff-changed img {
+  border:solid 2px #ffb;
+}
+span.diff-added {
+  background:#cfc;
+}
+span.diff-added img {
+  border: solid 2px #cfc;
+}
 
 /**
  * Traditional split diff theming
@@ -32,42 +48,43 @@ table.diff {
   table-layout: fixed;
   width: 100%;
 }
-table.diff tr.even, table.diff tr.odd {
+table.diff .even, table.diff .odd {
   background-color: inherit;
   border: none;
 }
-td.diff-prevlink {
+table.diff .diff-prevlink {
   text-align: left;
 }
-td.diff-nextlink {
+table.diff .diff-nextlink {
   text-align: right;
 }
-td.diff-section-title, div.diff-section-title {
+table.diff .diff-section-title,
+table.diff  .diff-section-title {
   background-color: #f0f0ff;
   font-size: 0.83em;
   font-weight: bold;
   padding: 0.1em 1em;
 }
-td.diff-context {
+table.diff .diff-context {
     background-color: #fafafa;
 }
-td.diff-deletedline {
+table.diff .diff-deletedline {
   background-color: #ffa;
   width: 50%;
 }
-td.diff-addedline {
+table.diff .diff-addedline {
   background-color: #afa;
   width: 50%;
 }
-span.diffchange {
+table.diff .diffchange {
   color: #f00;
   font-weight: bold;
 }
 
-table.diff col.diff-marker {
+table.diff .diff-marker {
   width: 1.4em;
 }
-table.diff col.diff-content {
+table.diff .diff-content {
   width: 50%;
 }
 table.diff th {