diff --git a/plugins/woocommerce-admin/client/components/calendar/style.scss b/plugins/woocommerce-admin/client/components/calendar/style.scss
index 08f746a81fa..8f85f829cfa 100644
--- a/plugins/woocommerce-admin/client/components/calendar/style.scss
+++ b/plugins/woocommerce-admin/client/components/calendar/style.scss
@@ -117,10 +117,10 @@
 
 		.woocommerce-calendar__input-text {
 			border: 1px solid $error-red;
-			box-shadow: inset 0px 0px 8px $error-red;
+			box-shadow: inset 0 0 8px $error-red;
 
 			&:focus {
-				box-shadow: inset 0px 0px 8px $error-red, 0 0 6px rgba(30, 140, 190, 0.8);
+				box-shadow: inset 0 0 8px $error-red, 0 0 6px rgba(30, 140, 190, 0.8);
 			}
 		}
 	}
@@ -160,7 +160,7 @@
 				text-align: center;
 			}
 
-			&:not(.no-arrow):not(.is-mobile).is-bottom:before {
+			&:not(.no-arrow):not(.is-mobile).is-bottom::before {
 				border-bottom-color: $core-grey-dark-400;
 				z-index: 1;
 				top: -6px;
diff --git a/plugins/woocommerce-admin/client/components/chart/style.scss b/plugins/woocommerce-admin/client/components/chart/style.scss
index 100ac691a0b..9a4c46445d9 100644
--- a/plugins/woocommerce-admin/client/components/chart/style.scss
+++ b/plugins/woocommerce-admin/client/components/chart/style.scss
@@ -349,7 +349,7 @@
 					width: 16px;
 					background-color: $white;
 
-					&:after {
+					&::after {
 						content: '';
 						position: absolute;
 						display: none;
@@ -359,7 +359,7 @@
 						background-color: currentColor;
 						border-color: currentColor;
 
-						&:after {
+						&::after {
 							display: block;
 							left: 5px;
 							top: 2px;
diff --git a/plugins/woocommerce-admin/client/components/count/style.scss b/plugins/woocommerce-admin/client/components/count/style.scss
index 3ab1a96a058..bcd3b6ef5d1 100644
--- a/plugins/woocommerce-admin/client/components/count/style.scss
+++ b/plugins/woocommerce-admin/client/components/count/style.scss
@@ -3,6 +3,6 @@
 .woocommerce-count {
 	border: 1px solid;
 	border-radius: 10px;
-	padding: 0px 8px;
+	padding: 0 8px;
 	font-weight: bold;
 }
diff --git a/plugins/woocommerce-admin/client/components/ellipsis-menu/style.scss b/plugins/woocommerce-admin/client/components/ellipsis-menu/style.scss
index 44c4543a886..28a87540d0a 100644
--- a/plugins/woocommerce-admin/client/components/ellipsis-menu/style.scss
+++ b/plugins/woocommerce-admin/client/components/ellipsis-menu/style.scss
@@ -14,8 +14,8 @@
 .woocommerce-ellipsis-menu__popover {
 	text-align: left;
 
-	&:not(.is-mobile):before,
-	&:not(.is-mobile):after {
+	&:not(.is-mobile)::before,
+	&:not(.is-mobile)::after {
 		margin-left: -16px;
 	}
 
diff --git a/plugins/woocommerce-admin/client/components/split-button/style.scss b/plugins/woocommerce-admin/client/components/split-button/style.scss
index de5716d84d2..46f90cc4bba 100644
--- a/plugins/woocommerce-admin/client/components/split-button/style.scss
+++ b/plugins/woocommerce-admin/client/components/split-button/style.scss
@@ -3,7 +3,7 @@
 .woocommerce-split-button {
 	display: flex;
 	align-items: center;
-	padding: $gap-smallest 0px $gap-smallest 0px;
+	padding: $gap-smallest 0 $gap-smallest 0;
 
 	.woocommerce-split-button__menu {
 		padding: 0;
diff --git a/plugins/woocommerce-admin/client/components/table/style.scss b/plugins/woocommerce-admin/client/components/table/style.scss
index 205aea935c8..333fe37d4d5 100644
--- a/plugins/woocommerce-admin/client/components/table/style.scss
+++ b/plugins/woocommerce-admin/client/components/table/style.scss
@@ -114,7 +114,7 @@
 .woocommerce-table__table {
 	overflow-x: auto;
 
-	&:after {
+	&::after {
 		content: '';
 		position: absolute;
 		right: 0;
@@ -125,7 +125,7 @@
 		visibility: hidden;
 	}
 
-	&.is-scrollable:after {
+	&.is-scrollable::after {
 		visibility: visible;
 	}
 
@@ -294,7 +294,7 @@ th.woocommerce-table__item {
 		font-weight: 600;
 	}
 
-	& + .woocommerce-table__summary-item:before {
+	& + .woocommerce-table__summary-item::before {
 		content: '/';
 		margin: 0 $gap-smallest;
 	}
diff --git a/plugins/woocommerce-admin/client/header/activity-panel/style.scss b/plugins/woocommerce-admin/client/header/activity-panel/style.scss
index 450ca4f0cd8..e484927c772 100644
--- a/plugins/woocommerce-admin/client/header/activity-panel/style.scss
+++ b/plugins/woocommerce-admin/client/header/activity-panel/style.scss
@@ -61,8 +61,8 @@
 
 	.components-icon-button {
 		display: initial;
-		text-indent: 0px;
-		border-radius: 0px;
+		text-indent: 0;
+		border-radius: 0;
 	}
 
 	.woocommerce-layout__activity-panel-tab {
@@ -95,8 +95,8 @@
 			font-size: 13px;
 		}
 
-		&.has-unread:after,
-		&.woocommerce-layout__activity-panel-tab-wordpress-notices:after {
+		&.has-unread::after,
+		&.woocommerce-layout__activity-panel-tab-wordpress-notices::after {
 			content: ' ';
 			position: absolute;
 			padding: 1px;
@@ -131,8 +131,8 @@
 			background-color: $core-grey-light-200;
 			box-shadow: none;
 
-			&.has-unread:after,
-			&.woocommerce-layout__activity-panel-tab-wordpress-notices:after {
+			&.has-unread::after,
+			&.woocommerce-layout__activity-panel-tab-wordpress-notices::after {
 				border-color: $core-grey-light-200;
 			}
 		}
@@ -142,8 +142,8 @@
 		&:hover:not(.is-active),
 		&.components-button:not(.is-active):not(:disabled):not([aria-disabled='true']):hover {
 			border-bottom: 3px solid $core-grey-light-200;
-			&.has-unread:after,
-			&.woocommerce-layout__activity-panel-tab-wordpress-notices:after {
+			&.has-unread::after,
+			&.woocommerce-layout__activity-panel-tab-wordpress-notices::after {
 				border-color: $core-grey-light-200;
 			}
 		}
@@ -162,7 +162,7 @@
 	}
 }
 
-.woocommerce-layout__activity-panel-toggle-bubble.has-unread:after {
+.woocommerce-layout__activity-panel-toggle-bubble.has-unread::after {
 	content: ' ';
 	position: absolute;
 	padding: 1px;
@@ -198,10 +198,10 @@
 	min-height: calc(100vh - 80px);
 	background: $core-grey-light-200;
 	box-shadow: 0 12px 12px 0 rgba(85, 93, 102, 0.3);
-	width: 0px;
+	width: 0;
 	@include activity-panel-slide();
 	position: fixed;
-	right: 0px;
+	right: 0;
 	top: 92px;
 	z-index: 1000;
 	overflow-x: hidden;
@@ -245,7 +245,7 @@
 	}
 
 	.woocommerce-activity-card__subtitle {
-		span + span:before {
+		span + span::before {
 			content: ' \2022 ';
 		}
 	}
diff --git a/plugins/woocommerce-admin/client/header/style.scss b/plugins/woocommerce-admin/client/header/style.scss
index f9b5b6d54c1..46bfb4b9fb2 100644
--- a/plugins/woocommerce-admin/client/header/style.scss
+++ b/plugins/woocommerce-admin/client/header/style.scss
@@ -7,7 +7,7 @@
 	flex-direction: row;
 	box-sizing: border-box;
 	border-bottom: 1px solid $white;
-	padding: 0px;
+	padding: 0;
 	height: 80px;
 	position: fixed;
 	width: 100%;
diff --git a/plugins/woocommerce-admin/client/stylesheets/abstracts/_mixins.scss b/plugins/woocommerce-admin/client/stylesheets/abstracts/_mixins.scss
index 2ef64f4e4a3..5a6d9743c7b 100644
--- a/plugins/woocommerce-admin/client/stylesheets/abstracts/_mixins.scss
+++ b/plugins/woocommerce-admin/client/stylesheets/abstracts/_mixins.scss
@@ -23,7 +23,7 @@
 	background-color: $core-grey-light-500;
 	color: transparent;
 
-	&:after {
+	&::after {
 		content: '\00a0';
 	}
 }
diff --git a/plugins/woocommerce-admin/client/stylesheets/shared/_reset.scss b/plugins/woocommerce-admin/client/stylesheets/shared/_reset.scss
index 1d9030f180c..4c67545a05d 100644
--- a/plugins/woocommerce-admin/client/stylesheets/shared/_reset.scss
+++ b/plugins/woocommerce-admin/client/stylesheets/shared/_reset.scss
@@ -25,7 +25,7 @@
 		}
 	}
 
-	.wp-has-current-submenu:after {
+	.wp-has-current-submenu::after {
 		right: 0;
 		border: 8px solid transparent;
 		content: ' ';
@@ -90,7 +90,7 @@
 			left: -5px;
 			width: 60px;
 
-			.ab-icon:before {
+			.ab-icon::before {
 				color: $white;
 			}
 
@@ -107,7 +107,7 @@
 			left: -5px;
 			width: 60px;
 
-			.ab-icon:before {
+			.ab-icon::before {
 				color: $white !important;
 			}