diff --git a/.stylelintrc b/.stylelintrc
new file mode 100644
index 0000000..7c14c41
--- /dev/null
+++ b/.stylelintrc
@@ -0,0 +1,6 @@
+{
+  "extends": "stylelint-config-wordpress",
+  "rules": {
+    "font-weight-notation": "named-where-possible"
+  }
+}
diff --git a/dev-lib b/dev-lib
index fd0b392..73fdbd2 160000
--- a/dev-lib
+++ b/dev-lib
@@ -1 +1 @@
-Subproject commit fd0b392c8b5e0867010965cac769d69744a36ccb
+Subproject commit 73fdbd22c3f4ca527385c7e648dc48dae2405beb
diff --git a/package.json b/package.json
index f191771..d9ee505 100644
--- a/package.json
+++ b/package.json
@@ -21,6 +21,9 @@
     "grunt-cli": "^1.2.0",
     "grunt-contrib-qunit": "^1.2.0",
     "qunitjs": "1.18.0",
-    "sinon": "^1.8.2"
+    "sinon": "^1.8.2",
+    "stylelint": "^7.10.1",
+    "stylelint-config-wordpress": "^11.0.0",
+    "stylelint-formatter-compact": "^0.1.0"
   }
 }
diff --git a/wp-admin/css/widgets/media-widgets.css b/wp-admin/css/widgets/media-widgets.css
index 1299159..0cc815a 100644
--- a/wp-admin/css/widgets/media-widgets.css
+++ b/wp-admin/css/widgets/media-widgets.css
@@ -17,6 +17,7 @@
 	margin-left: 8px;
 	width: auto;
 }
+
 .media-widget-control:not(.selected) .media-widget-buttons .button,
 .media-widget-buttons .button:first-child {
 	margin-left: 0;
@@ -38,19 +39,24 @@
 .media-widget-control .media-widget-preview {
 	text-align: center;
 }
+
 .media-widget-control .media-widget-preview .notice {
 	text-align: initial;
 }
+
 .media-frame .media-widget-embed-notice p code,
 .media-widget-control .notice p code {
 	padding: 0 3px 0 0;
 }
+
 .media-frame .media-widget-embed-notice {
 	margin-top: 16px;
 }
+
 .media-widget-control .media-widget-preview img {
 	max-width: 100%;
 }
+
 .media-widget-control .media-widget-preview .wp-video-shortcode {
 	background: #000;
 }
@@ -76,15 +82,15 @@
 	display: inline-block;
 	min-height: 132px;
 	width: 100%;
-	background: black;
+	background: #000;
 }
 
 .media-widget-video-link .dashicons {
-	font: normal 60px/1 'dashicons';
+	font: normal 60px/1 dashicons;
 	position: relative;
 	width: 100%;
 	top: -90px;
-	color: white;
+	color: #fff;
 	text-decoration: none;
 }
 
@@ -100,12 +106,15 @@
 .wp-customizer div.mce-tooltip {
 	z-index: 500100 !important;
 }
+
 .wp-customizer .ui-autocomplete.wplink-autocomplete {
 	z-index: 500110; /* originally 100110, but z-index of .wp-full-overlay is 500000 */
 }
+
 .wp-customizer #wp-link-backdrop {
 	z-index: 500100; /* originally 100100, but z-index of .wp-full-overlay is 500000 */
 }
+
 .wp-customizer #wp-link-wrap {
 	z-index: 500105; /* originally 100105, but z-index of .wp-full-overlay is 500000 */
 }