Animated smooth scroll plain js, simple

smooth-scroll-vanilla.js

// attach animated scroll to all hash links
document.querySelectorAll("a[href^='#']").forEach(element => {
  const [, id] = element.href.split('#')
  element.addEventListener("click", e => {
    e.preventDefault()
    document
      .getElementById(id)
      .scrollIntoView({behavior: 'smooth'});
  })
});