chore: make build smooth by applying new syntax

Author: jstarpl

packages/webui/src/client/styles/propertiesPanel.scss

@@ -188,13 +188,15 @@
 				> .propertiespanel-pop-up__groupselector__button {
 					@include item-type-colors();
 
-					width: 50px;
-					height: 30px;
-					border: 0px;
-					margin: 3px;
-					gap: 10px;
-					color: #ddd;
-					opacity: 0.2;
+					& {
+						width: 50px;
+						height: 30px;
+						border: 0px;
+						margin: 3px;
+						gap: 10px;
+						color: #ddd;
+						opacity: 0.2;
+					}
 
 					&.splits {
 						background: linear-gradient(