add layer to apply check

src/compiler/compile/css/Stylesheet.ts

@@ -170,7 +170,7 @@ class Atrule {
 	}
 
 	apply(node: Element) {
-		if (this.node.name === 'media' || this.node.name === 'supports') {
+		if (this.node.name === 'media' || this.node.name === 'supports' || this.node.name === 'layer') {
 			this.children.forEach(child => {
 				child.apply(node);
 			});