diff --git a/core/modules/block/css/block.admin.css b/core/modules/block/css/block.admin.css
index 16bee33..2b818c9 100644
--- a/core/modules/block/css/block.admin.css
+++ b/core/modules/block/css/block.admin.css
@@ -18,7 +18,7 @@
 a.block-demo-backlink,
 a.block-demo-backlink:link,
 a.block-demo-backlink:visited {
-  background-color: #b4d7f0;
+  background-color: #bde;
   border-radius: 0 0 10px 10px;
   color: #000;
   font-family: "Lucida Grande", Verdana, sans-serif;
diff --git a/core/modules/block_place/css/block-place.css b/core/modules/block_place/css/block-place.css
index aa3eccb..72b0f40 100644
--- a/core/modules/block_place/css/block-place.css
+++ b/core/modules/block_place/css/block-place.css
@@ -14,8 +14,8 @@
 
 .block-place-region a.button {
   position: relative;
-  background: url(../../../misc/icons/bebebe/plus.svg) #ffffff center center / 16px 16px no-repeat;
-  border: 1px solid #cccccc;
+  background: url(../../../misc/icons/bebebe/plus.svg) #fff center center / 16px 16px no-repeat;
+  border: 1px solid #ccc;
   box-sizing: border-box;
   font-size: 1rem;
   padding: 0;
diff --git a/core/modules/ckeditor/css/ckeditor.css b/core/modules/ckeditor/css/ckeditor.css
index b4b1e16..bc2c43a 100644
--- a/core/modules/ckeditor/css/ckeditor.css
+++ b/core/modules/ckeditor/css/ckeditor.css
@@ -7,7 +7,7 @@
 
 .ckeditor-dialog-loading-link {
   border-radius: 0 0 5px 5px;
-  border: 1px solid #B6B6B6;
+  border: 1px solid #b6b6b6;
   border-top: none;
   background: white;
   padding: 3px 10px;
diff --git a/core/modules/content_moderation/css/content_moderation.theme.css b/core/modules/content_moderation/css/content_moderation.theme.css
index 7941930..17f095f 100644
--- a/core/modules/content_moderation/css/content_moderation.theme.css
+++ b/core/modules/content_moderation/css/content_moderation.theme.css
@@ -3,5 +3,5 @@
  * Theme styles for the content_moderation module.
  */
 ul.entity-moderation-form {
-  border-bottom: 1px solid gray;
+  border-bottom: 1px solid #ccc;
 }
diff --git a/core/modules/shortcut/css/shortcut.theme.css b/core/modules/shortcut/css/shortcut.theme.css
index 73d58c6..3fe631c 100644
--- a/core/modules/shortcut/css/shortcut.theme.css
+++ b/core/modules/shortcut/css/shortcut.theme.css
@@ -32,11 +32,11 @@
   margin-right: 0.3em;
 }
 .shortcut-action__message {
-  background: #000000;
+  background: #000;
   background: rgba(0, 0, 0, 0.5);
   border-radius: 5px;
   padding: 0 5px;
-  color: #ffffff;
+  color: #fff;
   display: inline-block;
   margin-left: 0.3em; /* LTR */
   opacity: 0;
diff --git a/core/modules/system/css/system.admin.css b/core/modules/system/css/system.admin.css
index be739ac..e42cee0 100644
--- a/core/modules/system/css/system.admin.css
+++ b/core/modules/system/css/system.admin.css
@@ -117,7 +117,7 @@ small .admin-link:after {
   text-transform: none;
 }
 .system-modules td details a {
-  color: #5C5C5B;
+  color: #5c5c5b;
   border: 0px;
 }
 .system-modules td details {
diff --git a/core/modules/toolbar/css/toolbar.menu.css b/core/modules/toolbar/css/toolbar.menu.css
index c9d22d7..d97c71a 100644
--- a/core/modules/toolbar/css/toolbar.menu.css
+++ b/core/modules/toolbar/css/toolbar.menu.css
@@ -53,38 +53,38 @@
  */
 .toolbar .level-2 > ul {
   background-color: #fafafa;
-  border-bottom-color: #cccccc;
+  border-bottom-color: #ccc;
   border-top-color: #e5e5e5;
 }
 .toolbar .level-3 > ul {
   background-color: #f5f5f5;
   border-bottom-color: #c5c5c5;
-  border-top-color: #dddddd;
+  border-top-color: #ddd;
 }
 .toolbar .level-4 > ul {
-  background-color: #eeeeee;
-  border-bottom-color: #bbbbbb;
+  background-color: #eee;
+  border-bottom-color: #bbb;
   border-top-color: #d5d5d5;
 }
 .toolbar .level-5 > ul {
   background-color: #e5e5e5;
   border-bottom-color: #b5b5b5;
-  border-top-color: #cccccc;
+  border-top-color: #ccc;
 }
 .toolbar .level-6 > ul {
-  background-color: #eeeeee;
-  border-bottom-color: #aaaaaa;
+  background-color: #eee;
+  border-bottom-color: #aaa;
   border-top-color: #c5c5c5;
 }
 .toolbar .level-7 > ul {
   background-color: #fafafa;
   border-bottom-color: #b5b5b5;
-  border-top-color: #cccccc;
+  border-top-color: #ccc;
 }
 .toolbar .level-8 > ul {
-  background-color: #dddddd;
-  border-bottom-color: #cccccc;
-  border-top-color: #dddddd;
+  background-color: #ddd;
+  border-bottom-color: #ccc;
+  border-top-color: #ddd;
 }
 
 /**
diff --git a/core/modules/toolbar/css/toolbar.theme.css b/core/modules/toolbar/css/toolbar.theme.css
index 3af712b..0d96cb8 100644
--- a/core/modules/toolbar/css/toolbar.theme.css
+++ b/core/modules/toolbar/css/toolbar.theme.css
@@ -67,16 +67,16 @@
 }
 .toolbar .toolbar-tray-vertical {
   background-color: #f5f5f5;
-  border-right: 1px solid #aaaaaa; /* LTR */
+  border-right: 1px solid #aaa; /* LTR */
   box-shadow: -1px 0 5px 2px rgba(0, 0, 0, 0.3333); /* LTR */
 }
 [dir="rtl"] .toolbar .toolbar-tray-vertical {
-  border-left: 1px solid #aaaaaa;
+  border-left: 1px solid #aaa;
   border-right: 0 none;
   box-shadow: 1px 0 5px 2px rgba(0, 0, 0, 0.3333);
 }
 .toolbar-horizontal .toolbar-tray {
-  border-bottom: 1px solid #aaaaaa;
+  border-bottom: 1px solid #aaa;
   box-shadow: -2px 1px 3px 1px rgba(0, 0, 0, 0.3333); /* LTR */
 }
 [dir="rtl"] .toolbar-horizontal .toolbar-tray {
@@ -99,33 +99,33 @@
   text-decoration: underline;
 }
 .toolbar .toolbar-menu {
-  background-color: #ffffff;
+  background-color: #fff;
 }
 .toolbar-horizontal .toolbar-tray .menu-item + .menu-item {
-  border-left: 1px solid #dddddd; /* LTR */
+  border-left: 1px solid #ddd; /* LTR */
 }
 [dir="rtl"] .toolbar-horizontal .toolbar-tray .menu-item + .menu-item {
   border-left: 0 none;
-  border-right: 1px solid #dddddd;
+  border-right: 1px solid #ddd;
 }
 .toolbar-horizontal .toolbar-tray .menu-item:last-child {
-  border-right: 1px solid #dddddd; /* LTR */
+  border-right: 1px solid #ddd; /* LTR */
 }
 [dir="rtl"] .toolbar-horizontal .toolbar-tray .menu-item:last-child {
-  border-left: 1px solid #dddddd;
+  border-left: 1px solid #ddd;
 }
 .toolbar .toolbar-tray-vertical .menu-item + .menu-item {
-  border-top: 1px solid #dddddd;
+  border-top: 1px solid #ddd;
 }
 .toolbar .toolbar-tray-vertical .menu-item:last-child {
-  border-bottom: 1px solid #dddddd;
+  border-bottom: 1px solid #ddd;
 }
 .toolbar .toolbar-tray-vertical .menu-item .menu-item {
   border: 0 none;
 }
 .toolbar .toolbar-tray-vertical .toolbar-menu ul ul {
-  border-bottom: 1px solid #dddddd;
-  border-top: 1px solid #dddddd;
+  border-bottom: 1px solid #ddd;
+  border-top: 1px solid #ddd;
 }
 .toolbar .toolbar-tray-vertical .menu-item:last-child > ul {
   border-bottom: 0;
diff --git a/core/modules/views_ui/css/views_ui.admin.theme.css b/core/modules/views_ui/css/views_ui.admin.theme.css
index 30616f0..3029249 100644
--- a/core/modules/views_ui/css/views_ui.admin.theme.css
+++ b/core/modules/views_ui/css/views_ui.admin.theme.css
@@ -623,10 +623,10 @@ td.group-title {
   border: none;
 }
 .views-ui-dialog .views-offset-top {
-  border-bottom: 1px solid #CCC;
+  border-bottom: 1px solid #ccc;
 }
 .views-ui-dialog .views-offset-bottom {
-  border-top: 1px solid #CCC;
+  border-top: 1px solid #ccc;
 }
 .views-ui-dialog .views-override > * {
   margin: 0;
diff --git a/core/themes/bartik/css/colors.css b/core/themes/bartik/css/colors.css
index 41dc054..6d71a9e 100644
--- a/core/themes/bartik/css/colors.css
+++ b/core/themes/bartik/css/colors.css
@@ -8,14 +8,14 @@ body {
 #main-wrapper,
 .region-primary-menu .menu-item a.is-active,
 .region-primary-menu .menu-item--active-trail a {
-  background: #ffffff;
+  background: #fff;
 }
 .tabs ul.primary li a.is-active {
-  background-color: #ffffff;
+  background-color: #fff;
 }
 .tabs ul.primary li.is-active a {
-  background-color: #ffffff;
-  border-bottom-color: #ffffff;
+  background-color: #fff;
+  border-bottom-color: #fff;
 }
 #header {
   background-color: #1d84c3;
diff --git a/core/themes/bartik/css/components/captions.css b/core/themes/bartik/css/components/captions.css
index cd24809..1564e8b 100644
--- a/core/themes/bartik/css/components/captions.css
+++ b/core/themes/bartik/css/components/captions.css
@@ -3,12 +3,12 @@
   margin-bottom: 1.2em;
 }
 .caption > * {
-  background: #F3F3F3;
+  background: #f3f3f3;
   padding: 0.5ex;
-  border: 1px solid #CCC;
+  border: 1px solid #ccc;
 }
 .caption > figcaption {
-  border: 1px solid #CCC;
+  border: 1px solid #ccc;
   border-top: none;
   padding-top: 0.5ex;
   font-size: small;
diff --git a/core/themes/bartik/css/components/tabs.css b/core/themes/bartik/css/components/tabs.css
index 6f232fe..5ed9283 100644
--- a/core/themes/bartik/css/components/tabs.css
+++ b/core/themes/bartik/css/components/tabs.css
@@ -21,7 +21,7 @@ div.tabs {
   text-shadow: 0 1px 0 #fff;
 }
 .tabs ul.primary li.is-active a {
-  background-color: #ffffff;
+  background-color: #fff;
   border: 1px solid #bbb;
 }
 @media screen and (max-width: 37.5em) { /* 600px */
diff --git a/core/themes/bartik/css/components/views.css b/core/themes/bartik/css/components/views.css
index 6171257..1e45f57 100644
--- a/core/themes/bartik/css/components/views.css
+++ b/core/themes/bartik/css/components/views.css
@@ -9,7 +9,7 @@
 }
 .views-displays .tabs .open > a:hover,
 .views-displays .tabs .open > a:focus {
-  color: #0071B3;
+  color: #0071b3;
 }
 .views-displays .secondary .form-submit {
   font-size: 0.846em;
@@ -22,14 +22,14 @@
 
 /* Contextual filter options styles */
 .views-filterable-options .filterable-option:nth-of-type(even) .form-type-checkbox {
-  background-color: #F9F9F9;
+  background-color: #f9f9f9;
 }
 
 /* Views action dropbutton styles */
 .views-ui-display-tab-actions .dropbutton .form-submit {
-  color: #0071B3;
+  color: #0071b3;
 }
 .views-ui-display-tab-actions .dropbutton .form-submit:hover,
 .views-ui-display-tab-actions .dropbutton .form-submit:focus {
-  color: #018FE2;
+  color: #018fe2;
 }
diff --git a/core/themes/classy/css/components/dropbutton.css b/core/themes/classy/css/components/dropbutton.css
index cf8c40a..45e457b 100644
--- a/core/themes/classy/css/components/dropbutton.css
+++ b/core/themes/classy/css/components/dropbutton.css
@@ -5,7 +5,7 @@
 
 .js .dropbutton-widget {
   background-color: white;
-  border: 1px solid #cccccc;
+  border: 1px solid #ccc;
 }
 .js .dropbutton-widget:hover {
   border-color: #b8b8b8;
diff --git a/core/themes/seven/css/base/elements.css b/core/themes/seven/css/base/elements.css
index 51f19f0..127ad01 100644
--- a/core/themes/seven/css/base/elements.css
+++ b/core/themes/seven/css/base/elements.css
@@ -23,7 +23,7 @@ hr {
   padding: 0;
   border: none;
   height: 1px;
-  background: #cccccc;
+  background: #ccc;
 }
 summary,
 .fieldgroup:not(.form-composite) > legend {
diff --git a/core/themes/seven/css/components/buttons.css b/core/themes/seven/css/components/buttons.css
index 479ca9c..0c46353 100644
--- a/core/themes/seven/css/components/buttons.css
+++ b/core/themes/seven/css/components/buttons.css
@@ -62,7 +62,7 @@
 /* Prevent focus ring being covered by next siblings. */
 .button:focus {
   z-index: 10;
-  border: 1px solid #3AB2FF;
+  border: 1px solid #3ab2ff;
   box-shadow: 0 0 0.5em 0.1em hsla(203, 100%, 60%, 0.7);
 }
 .button:active {
diff --git a/core/themes/seven/css/components/dialog.css b/core/themes/seven/css/components/dialog.css
index 6d01820..a82f31a 100644
--- a/core/themes/seven/css/components/dialog.css
+++ b/core/themes/seven/css/components/dialog.css
@@ -29,7 +29,7 @@
   font-size: 1.231em;
   font-weight: 600;
   margin: 0;
-  color: #ffffff;
+  color: #fff;
   -webkit-font-smoothing: antialiased;
 }
 .ui-dialog .ui-dialog-titlebar-close {
@@ -51,7 +51,7 @@
   margin-top: -12px;
 }
 .ui-dialog .ui-widget-content.ui-dialog-content {
-  background: #ffffff;
+  background: #fff;
   overflow: auto;
   padding: 1em;
 }
diff --git a/core/themes/seven/css/components/dropbutton.component.css b/core/themes/seven/css/components/dropbutton.component.css
index 2cf0141..001ef9a 100644
--- a/core/themes/seven/css/components/dropbutton.component.css
+++ b/core/themes/seven/css/components/dropbutton.component.css
@@ -9,7 +9,7 @@
 .js .dropbutton .dropbutton-action > input,
 .js .dropbutton .dropbutton-action > a,
 .js .dropbutton .dropbutton-action > button {
-  color: #333333;
+  color: #333;
   text-decoration: none;
   padding: 0;
   margin: 0;
@@ -173,7 +173,7 @@
   background-color: #f2f1eb;
   background-image: -webkit-linear-gradient(top, #f6f6f3, #e7e7df);
   background-image: linear-gradient(to bottom, #f6f6f3, #e7e7df);
-  color: #333333;
+  color: #333;
   text-decoration: none;
   text-shadow: 0 1px hsla(0, 0%, 100%, 0.6);
   font-weight: 600;
diff --git a/core/themes/seven/css/components/jquery.ui/theme.css b/core/themes/seven/css/components/jquery.ui/theme.css
index dd81ec2..0ca0671 100644
--- a/core/themes/seven/css/components/jquery.ui/theme.css
+++ b/core/themes/seven/css/components/jquery.ui/theme.css
@@ -347,8 +347,8 @@
 .ui-slider .ui-slider-handle {
   border: 1px solid #e4e4e4;
   border-bottom: 1px solid #b4b4b4;
-  border-left-color: #D2D2D2;
-  border-right-color: #D2D2D2;
+  border-left-color: #d2d2d2;
+  border-right-color: #d2d2d2;
   background-color: #e4e4e4;
   border-radius: 4px;
 }
@@ -375,16 +375,16 @@
  * Date Picker
  */
 .ui-datepicker {
-  border: 1px solid #A6A6A6;
-  background: #FFF;
+  border: 1px solid #a6a6a6;
+  background: #fff;
   /* Override datepicker.css */
   padding: 0;
 }
 
 /* Override tables.css */
 .ui-datepicker-calendar thead tr {
-  border-bottom: 1px solid #A6A6A6;
-  border-top: 1px solid #A6A6A6;
+  border-bottom: 1px solid #a6a6a6;
+  border-top: 1px solid #a6a6a6;
 }
 .ui-datepicker-calendar tr:hover {
   background: transparent;
diff --git a/core/themes/seven/css/components/system-status-counter.css b/core/themes/seven/css/components/system-status-counter.css
index 8d71965..ecba867 100644
--- a/core/themes/seven/css/components/system-status-counter.css
+++ b/core/themes/seven/css/components/system-status-counter.css
@@ -11,7 +11,7 @@
   display: inline-block;
   width: 100%;
   white-space: nowrap;
-  background: #FCFCFA;
+  background: #fcfcfa;
 }
 .system-status-counter__status-icon {
   display: inline-block;
diff --git a/core/themes/seven/css/components/tabs.css b/core/themes/seven/css/components/tabs.css
index 5aab30b..fa3d585 100644
--- a/core/themes/seven/css/components/tabs.css
+++ b/core/themes/seven/css/components/tabs.css
@@ -9,7 +9,7 @@
 .is-horizontal .tabs:before {
   content: '';
   display: block;
-  background-color: #A6A6A6;
+  background-color: #a6a6a6;
   height: 1px;
   position: absolute;
   bottom: 0;
@@ -86,7 +86,7 @@ li.tabs__tab a {
   z-index: 15;
   border-color: #a6a6a6;
   border-radius: 4px 0 0 0; /* LTR */
-  background-color: #ffffff;
+  background-color: #fff;
   color: #004f80;
 }
 [dir="rtl"] .tabs.primary .tabs__tab.is-active {
@@ -174,7 +174,7 @@ li.tabs__tab a {
 }
 .is-open .tabs__tab.is-active {
   border-color: #a6a6a6;
-  background-color: #ffffff;
+  background-color: #fff;
   color: #004f80;
   border-bottom: 1px solid #a6a6a6;
 }
diff --git a/core/themes/seven/css/components/tour.theme.css b/core/themes/seven/css/components/tour.theme.css
index d2ac534..6bff9b1 100644
--- a/core/themes/seven/css/components/tour.theme.css
+++ b/core/themes/seven/css/components/tour.theme.css
@@ -95,7 +95,7 @@
 }
 
 .joyride-expose-wrapper {
-  background-color: #ffffff;
+  background-color: #fff;
 }
 
 .joyride-expose-cover {
diff --git a/core/themes/seven/css/components/views-ui.css b/core/themes/seven/css/components/views-ui.css
index d212dd0..83273b9 100644
--- a/core/themes/seven/css/components/views-ui.css
+++ b/core/themes/seven/css/components/views-ui.css
@@ -157,7 +157,7 @@ details.fieldset-no-legend {
 /* @group Attachment details */
 
 #edit-display-settings-title {
-  color: #008BCB;
+  color: #008bcb;
 }
 
 /* @end */
@@ -189,7 +189,7 @@ details.fieldset-no-legend {
 .views-displays .secondary .open > a:hover,
 .views-displays .secondary .open > a:focus {
   background-color: #f1f1f1;
-  color: #008BCB;
+  color: #008bcb;
 }
 
 .views-displays .secondary .action-list li:first-child {
@@ -266,11 +266,11 @@ details.fieldset-no-legend {
 }
 
 .views-ui-rearrange-filter-form tr.drag td {
-  background-color: #FFEE77 !important;
+  background-color: #ffee77 !important;
 }
 
 .views-ui-rearrange-filter-form tr.drag-previous td {
-  background-color: #FFFFBB !important;
+  background-color: #ffffbb !important;
 }
 
 /* @end */
diff --git a/core/themes/stable/css/ckeditor/ckeditor.css b/core/themes/stable/css/ckeditor/ckeditor.css
index b4b1e16..bc2c43a 100644
--- a/core/themes/stable/css/ckeditor/ckeditor.css
+++ b/core/themes/stable/css/ckeditor/ckeditor.css
@@ -7,7 +7,7 @@
 
 .ckeditor-dialog-loading-link {
   border-radius: 0 0 5px 5px;
-  border: 1px solid #B6B6B6;
+  border: 1px solid #b6b6b6;
   border-top: none;
   background: white;
   padding: 3px 10px;
diff --git a/core/themes/stable/css/shortcut/shortcut.theme.css b/core/themes/stable/css/shortcut/shortcut.theme.css
index 73d58c6..3fe631c 100644
--- a/core/themes/stable/css/shortcut/shortcut.theme.css
+++ b/core/themes/stable/css/shortcut/shortcut.theme.css
@@ -32,11 +32,11 @@
   margin-right: 0.3em;
 }
 .shortcut-action__message {
-  background: #000000;
+  background: #000;
   background: rgba(0, 0, 0, 0.5);
   border-radius: 5px;
   padding: 0 5px;
-  color: #ffffff;
+  color: #fff;
   display: inline-block;
   margin-left: 0.3em; /* LTR */
   opacity: 0;
diff --git a/core/themes/stable/css/system/system.admin.css b/core/themes/stable/css/system/system.admin.css
index 6f5f62b..8893c53 100644
--- a/core/themes/stable/css/system/system.admin.css
+++ b/core/themes/stable/css/system/system.admin.css
@@ -117,7 +117,7 @@ small .admin-link:after {
   text-transform: none;
 }
 .system-modules td details a {
-  color: #5C5C5B;
+  color: #5c5c5b;
   border: 0px;
 }
 .system-modules td details {
diff --git a/core/themes/stable/css/toolbar/toolbar.menu.css b/core/themes/stable/css/toolbar/toolbar.menu.css
index c9d22d7..d97c71a 100644
--- a/core/themes/stable/css/toolbar/toolbar.menu.css
+++ b/core/themes/stable/css/toolbar/toolbar.menu.css
@@ -53,38 +53,38 @@
  */
 .toolbar .level-2 > ul {
   background-color: #fafafa;
-  border-bottom-color: #cccccc;
+  border-bottom-color: #ccc;
   border-top-color: #e5e5e5;
 }
 .toolbar .level-3 > ul {
   background-color: #f5f5f5;
   border-bottom-color: #c5c5c5;
-  border-top-color: #dddddd;
+  border-top-color: #ddd;
 }
 .toolbar .level-4 > ul {
-  background-color: #eeeeee;
-  border-bottom-color: #bbbbbb;
+  background-color: #eee;
+  border-bottom-color: #bbb;
   border-top-color: #d5d5d5;
 }
 .toolbar .level-5 > ul {
   background-color: #e5e5e5;
   border-bottom-color: #b5b5b5;
-  border-top-color: #cccccc;
+  border-top-color: #ccc;
 }
 .toolbar .level-6 > ul {
-  background-color: #eeeeee;
-  border-bottom-color: #aaaaaa;
+  background-color: #eee;
+  border-bottom-color: #aaa;
   border-top-color: #c5c5c5;
 }
 .toolbar .level-7 > ul {
   background-color: #fafafa;
   border-bottom-color: #b5b5b5;
-  border-top-color: #cccccc;
+  border-top-color: #ccc;
 }
 .toolbar .level-8 > ul {
-  background-color: #dddddd;
-  border-bottom-color: #cccccc;
-  border-top-color: #dddddd;
+  background-color: #ddd;
+  border-bottom-color: #ccc;
+  border-top-color: #ddd;
 }
 
 /**
diff --git a/core/themes/stable/css/toolbar/toolbar.theme.css b/core/themes/stable/css/toolbar/toolbar.theme.css
index 3af712b..27e94bd 100644
--- a/core/themes/stable/css/toolbar/toolbar.theme.css
+++ b/core/themes/stable/css/toolbar/toolbar.theme.css
@@ -31,13 +31,13 @@
 .toolbar .toolbar-bar {
   background-color: #0f0f0f;
   box-shadow: -1px 0 3px 1px rgba(0, 0, 0, 0.3333); /* LTR */
-  color: #dddddd;
+  color: #ddd;
 }
 [dir="rtl"] .toolbar .toolbar-bar {
   box-shadow: 1px 0 3px 1px rgba(0, 0, 0, 0.3333);
 }
 .toolbar .toolbar-bar .toolbar-item {
-  color: #ffffff;
+  color: #fff;
 }
 .toolbar .toolbar-bar .toolbar-tab > .toolbar-item {
   font-weight: bold;
@@ -56,7 +56,7 @@
  * Toolbar tray.
  */
 .toolbar .toolbar-tray {
-  background-color: #ffffff;
+  background-color: #fff;
 }
 .toolbar-horizontal .toolbar-tray > .toolbar-lining {
   padding-right: 5em; /* LTR */
@@ -67,16 +67,16 @@
 }
 .toolbar .toolbar-tray-vertical {
   background-color: #f5f5f5;
-  border-right: 1px solid #aaaaaa; /* LTR */
+  border-right: 1px solid #aaa; /* LTR */
   box-shadow: -1px 0 5px 2px rgba(0, 0, 0, 0.3333); /* LTR */
 }
 [dir="rtl"] .toolbar .toolbar-tray-vertical {
-  border-left: 1px solid #aaaaaa;
+  border-left: 1px solid #aaa;
   border-right: 0 none;
   box-shadow: 1px 0 5px 2px rgba(0, 0, 0, 0.3333);
 }
 .toolbar-horizontal .toolbar-tray {
-  border-bottom: 1px solid #aaaaaa;
+  border-bottom: 1px solid #aaa;
   box-shadow: -2px 1px 3px 1px rgba(0, 0, 0, 0.3333); /* LTR */
 }
 [dir="rtl"] .toolbar-horizontal .toolbar-tray {
@@ -99,33 +99,33 @@
   text-decoration: underline;
 }
 .toolbar .toolbar-menu {
-  background-color: #ffffff;
+  background-color: #fff;
 }
 .toolbar-horizontal .toolbar-tray .menu-item + .menu-item {
-  border-left: 1px solid #dddddd; /* LTR */
+  border-left: 1px solid #ddd; /* LTR */
 }
 [dir="rtl"] .toolbar-horizontal .toolbar-tray .menu-item + .menu-item {
   border-left: 0 none;
-  border-right: 1px solid #dddddd;
+  border-right: 1px solid #ddd;
 }
 .toolbar-horizontal .toolbar-tray .menu-item:last-child {
-  border-right: 1px solid #dddddd; /* LTR */
+  border-right: 1px solid #ddd; /* LTR */
 }
 [dir="rtl"] .toolbar-horizontal .toolbar-tray .menu-item:last-child {
-  border-left: 1px solid #dddddd;
+  border-left: 1px solid #ddd;
 }
 .toolbar .toolbar-tray-vertical .menu-item + .menu-item {
-  border-top: 1px solid #dddddd;
+  border-top: 1px solid #ddd;
 }
 .toolbar .toolbar-tray-vertical .menu-item:last-child {
-  border-bottom: 1px solid #dddddd;
+  border-bottom: 1px solid #ddd;
 }
 .toolbar .toolbar-tray-vertical .menu-item .menu-item {
   border: 0 none;
 }
 .toolbar .toolbar-tray-vertical .toolbar-menu ul ul {
-  border-bottom: 1px solid #dddddd;
-  border-top: 1px solid #dddddd;
+  border-bottom: 1px solid #ddd;
+  border-top: 1px solid #ddd;
 }
 .toolbar .toolbar-tray-vertical .menu-item:last-child > ul {
   border-bottom: 0;
diff --git a/core/themes/stable/css/views_ui/views_ui.admin.theme.css b/core/themes/stable/css/views_ui/views_ui.admin.theme.css
index b843586..53a08d1 100644
--- a/core/themes/stable/css/views_ui/views_ui.admin.theme.css
+++ b/core/themes/stable/css/views_ui/views_ui.admin.theme.css
@@ -623,10 +623,10 @@ td.group-title {
   border: none;
 }
 .views-ui-dialog .views-offset-top {
-  border-bottom: 1px solid #CCC;
+  border-bottom: 1px solid #ccc;
 }
 .views-ui-dialog .views-offset-bottom {
-  border-top: 1px solid #CCC;
+  border-top: 1px solid #ccc;
 }
 .views-ui-dialog .views-override > * {
   margin: 0;