fixingOnTop.js

let infoTopFixed = false
window.addEventListener("scroll",function(e) {
  if (infoTopFixed) {
    let bodyOffsetY = document.body.getBoundingClientRect().y
    let posY = (document.body.classList.contains('header-promo-visible')) ? 96 : 48
    if (-1*bodyOffsetY <= posY) {
      infoTop.classList.remove('fixed')
      infoTopFixed = false
    }
  } else if (!infoTopFixed && infoTop.getBoundingClientRect().y <= 0) {
    infoTop.classList.add('fixed')
    infoTopFixed = true
  }
})