don't use !important

less/category.less

@@ -61,27 +61,27 @@
 				float: left;
 			}
 
-			&.selected {
-				.select .user-img, .select .user-icon {
+			.avatar .select:hover {
+				.user-img, .user-icon {
 					opacity: 0;
 				}
-
+				
 				.fa-check {
+					border: 1px solid @brand-primary;
+					color: @brand-primary;
 					opacity: 1;
-					border: 1px solid @brand-success !important;
-					color: @brand-success !important;
 				}
 			}
 			
-			.avatar .select:hover {
-				.user-img, .user-icon {
+			&.selected {
+				.select .user-img, .select .user-icon {
 					opacity: 0;
 				}
-				
-				.fa-check {
-					border: 1px solid @brand-primary;
-					color: @brand-primary;
+
+				.avatar .select .fa-check {
 					opacity: 1;
+					border: 1px solid @brand-success;
+					color: @brand-success;
 				}
 			}