javascript remove css class

//remove a css class from an element
document.getElementById("myElementID").classList.remove("class_name"); 

function removeClass() {
  var element = document.getElementById("myDIV");

    element.classList.remove("mystyle");
} 

const removeClass = (element, name) => {
    const pattern = new RegExp('(?:^|\\s)'+ name + '(?:\\s|$)', 'g');
    element.className = element.className.replace(pattern, "");
};