( function( window, document ) {

  const html        = document.querySelector( 'html' )
  const scrollToTop = html.querySelector( '#scroll-to-top' )
  const alignfull   = html.querySelectorAll( '.alignfull' )

  // Replace no-js class with js on html element
  html.classList.remove( 'no-js' )
  html.classList.add( 'js' )

  // Full alignment
  const scrollBarWidth = window.innerWidth - document.body.clientWidth
  for ( const element of alignfull ) {
    element.style.width      = `calc(100vw - ${scrollBarWidth}px)`
    element.style.marginLeft = `calc(50% - 50vw + ${scrollBarWidth / 2}px)`
  }

  // Scroll to top
  window.addEventListener( 'scroll', function() {
    scrollToTop.style.bottom = window.scrollY > 500 ? '20px' : '-2000px'
  } )

  scrollToTop.addEventListener( 'click', function(event) {
    event.preventDefault()
    window.scrollTo( { top: 0, behavior: 'smooth' } )
  } )

} ) ( typeof window != 'undefined' ? window : this, document )