Scope changing of css classes only to the ones existing in the style tag

src/webcomponents/stateless-web-component.js

@@ -13,6 +13,7 @@ export default class StatelessWebComponent extends HTMLElement {
 
   render() {
     const cssClassPrefix = this.constructor.name;
+
     const element = document.createElement('div');
     element.innerHTML = this.template();
 
@@ -28,7 +29,7 @@ export default class StatelessWebComponent extends HTMLElement {
 
     styleTag.textContent = css;
 
-    Array.from(element.querySelectorAll('[class]')).forEach((node) => {
+    Array.from(element.querySelectorAll(cssSelectors.join(','))).forEach((node) => {
       const classNames = Array.from(node.classList);
 
       classNames.forEach((className) => {