create a style tag in JS code example

Example 1: add style javascript

// Bad:
element.setAttribute("style", "background-color: red;");
// Good:
element.style.backgroundColor = "red";

Example 2: javascript style an element

// Getting the element first
var myElement = document.querySelector("#myElement");

// examples for updating styles
myElement.style.color = "blue";
myElement.style.backgroundColor = "red";