smooth scroll to top jquery

html {
  scroll-behavior: smooth;
}

/* No support in IE, or Safari
You can use this JS polyfill for those */
http://iamdustan.com/smoothscroll/

window.scrollTo({top: 0, behavior: 'smooth'});

reference : https://stackoverflow.com/questions/15935318/smooth-scroll-to-top

window.scrollTo({top: 0, behavior: 'smooth'});