diff --git a/src/wp-admin/css/admin-menu.css b/src/wp-admin/css/admin-menu.css
index 97f4f2606a..8606ede18e 100644
--- a/src/wp-admin/css/admin-menu.css
+++ b/src/wp-admin/css/admin-menu.css
@@ -458,13 +458,12 @@ ul#adminmenu > li.current > a.current:after {
 /* flyout menu arrow */
 #adminmenu li.wp-has-submenu.wp-not-current-submenu:hover:after {
 	right: 0;
-	border: solid transparent;
+	border: 8px solid transparent;
 	content: " ";
 	height: 0;
 	width: 0;
 	position: absolute;
 	pointer-events: none;
-	border-width: 8px;
 	top: 10px;
 	z-index: 10000;
 }
diff --git a/src/wp-admin/css/common.css b/src/wp-admin/css/common.css
index f2d85623fc..a863ff44fc 100644
--- a/src/wp-admin/css/common.css
+++ b/src/wp-admin/css/common.css
@@ -2700,9 +2700,8 @@ div.action-links {
 	left: 0;
 	margin-top: 10px;
 	margin-right: 250px; /* FYI box */
-	padding: 10px 26px;
+	padding: 10px 26px 99999px; /* equal height column trick */
 	margin-bottom: -99932px; /* 67px less than the padding below to accommodate footer height */
-	padding-bottom: 99999px; /* equal height column trick */
 }
 
 #section-holder .notice {
@@ -2718,9 +2717,8 @@ div.action-links {
 	position: relative;
 	top: 0;
 	right: 0;
-	padding: 16px;
+	padding: 16px 16px 99999px; /* equal height column trick */
 	margin-bottom: -99932px; /* 67px less than the padding below to accommodate footer height */
-	padding-bottom: 99999px; /* equal height column trick */
 	width: 217px;
 	border-left: 1px solid #dcdcde;
 	background: #f6f7f7;
diff --git a/src/wp-admin/css/customize-controls.css b/src/wp-admin/css/customize-controls.css
index 676bbf6b6c..e3b17f2c37 100644
--- a/src/wp-admin/css/customize-controls.css
+++ b/src/wp-admin/css/customize-controls.css
@@ -2368,8 +2368,7 @@ body.cheatin h1 {
 	font-size: 24px;
 	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
 	margin: 30px 0 0 0;
-	padding: 0;
-	padding-bottom: 7px;
+	padding: 0 0 7px;
 }
 
 body.cheatin p {
@@ -2387,8 +2386,7 @@ body.cheatin p {
 #customize-theme-controls .add-new-menu-item {
 	cursor: pointer;
 	float: right;
-	margin: 0;
-	margin-left: 10px;
+	margin: 0 0 0 10px;
 	transition: all 0.2s;
 	-webkit-user-select: none;
 	-ms-user-select: none;
diff --git a/src/wp-admin/css/edit.css b/src/wp-admin/css/edit.css
index a21cfa872e..e490cd7537 100644
--- a/src/wp-admin/css/edit.css
+++ b/src/wp-admin/css/edit.css
@@ -1850,10 +1850,7 @@ table.links-table {
 	}
 
 	.wp_themeSkin .mceSplitButton td a.mceAction {
-		padding-top: 6px;
-		padding-bottom: 6px;
-		padding-left: 6px;
-		padding-right: 3px;
+		padding: 6px 3px 6px 6px;
 	}
 
 	.wp_themeSkin .mceSplitButton td a.mceOpen,
diff --git a/src/wp-admin/css/install.css b/src/wp-admin/css/install.css
index c4978b9154..7a24331c33 100644
--- a/src/wp-admin/css/install.css
+++ b/src/wp-admin/css/install.css
@@ -36,8 +36,7 @@ h1, h2 {
 	clear: both;
 	color: #646970;
 	font-size: 24px;
-	padding: 0;
-	padding-bottom: 7px;
+	padding: 0 0 7px;
 	font-weight: 400;
 }
 
diff --git a/src/wp-admin/css/nav-menus.css b/src/wp-admin/css/nav-menus.css
index b243fc036c..3ddbe27301 100644
--- a/src/wp-admin/css/nav-menus.css
+++ b/src/wp-admin/css/nav-menus.css
@@ -386,8 +386,7 @@ ul.add-menu-item-tabs li {
 /* Listings */
 .nav-menus-php .list li {
 	display: none;
-	margin: 0;
-	margin-bottom: 5px;
+	margin: 0 0 5px;
 }
 
 .nav-menus-php .list li .menu-item-title {
diff --git a/src/wp-includes/css/editor.css b/src/wp-includes/css/editor.css
index 6704822f3d..a5c8deee37 100644
--- a/src/wp-includes/css/editor.css
+++ b/src/wp-includes/css/editor.css
@@ -1339,12 +1339,10 @@ i.mce-i-wp_code:before {
 #wp_delimgbtn,
 #wp_editgallery,
 #wp_delgallery {
-	border-color: #8c8f94;
 	background-color: #f0f0f1;
 	margin: 2px;
 	padding: 2px;
-	border-width: 1px;
-	border-style: solid;
+	border: 1px solid #8c8f94;
 	border-radius: 3px;
 }