.css color js code example
Example 1: add css in javascript
document.getElementById("demo").style.display = "none";
Example 2: javascript change color
var span = document.getElementsByTagName("span")[0];
span.style.color = "red";
document.getElementById("demo").style.display = "none";
var span = document.getElementsByTagName("span")[0];
span.style.color = "red";