how to include css in js code example

Example 1: add css in javascript

document.getElementById("demo").style.display = "none";

Example 2: javascript add css file

var cssFile = document.createElement('link');
    cssFile.rel = 'stylesheet';
    cssFile.href = "styles.css";  // or path for file {themes('/styles/mobile.css')}
    document.head.appendChild(cssFile); // append css to head element