Style the notice

services/web/app/views/project/editor/share.pug

@@ -177,7 +177,7 @@ script(type='text/ng-template', id='shareProjectModalTemplate')
 
 					p.small(ng-show="startedFreeTrial")
 						| #{translate("refresh_page_after_starting_free_trial")}
-			.row.public-access-level(ng-show="!isAdmin")
+			.row.public-access-level.public-access-level--notice(ng-show="!isAdmin")
 				.col-xs-12.text-center To add more collaborators, please ask the project owner
 	.modal-footer.modal-footer-share
 		.modal-footer-left

services/web/public/stylesheets/app/editor/share.less

@@ -30,6 +30,13 @@
 		}
 	}
 
+	.public-access-level.public-access-level--notice {
+		background-color: @gray-lightest;
+		border-bottom: none;
+		margin-top: @margin-md;
+		padding-top: @margin-md;
+	}
+
 	.project-member, .project-invite {
 		&:hover {
 			background-color: @gray-lightest;