Js Change Css Var Code Example


Example 1: how to change a css variable with javascript


var root = document.querySelector(':root');
root.style.setProperty('--variable', 'lightblue');
/or/
root.style.setProperty('--variable', myColor);

Example 2: how to change css variable in javascript


document.documentElement.style.setProperty("--main-background-color", "green");

Example 3: how to change css variable in javascript


document.documentElement.setAttribute("style", "--main-background-color: green");

Example 4: 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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