how to pass change css with javascript code example

Example 1: how to change css with js

document.querySelector('h1', container).style.backgroundColor = 'red';

Example 2: change css variable with javascript

let root = document.documentElement;

root.addEventListener("mousemove", e => {
  root.style.setProperty('--mouse-x', e.clientX + "px");
  root.style.setProperty('--mouse-y', e.clientY + "px");
});

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Javascript Example

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