let tag = document.createElement('script');
tag.src = "https://www.youtube.com/iframe_api";
let firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);
let player;
function onYouTubePlayerAPIReady() {
  player = new YT.Player("player", {
    events: {
      onReady: onPlayerReady
    }
  });
}
function onPlayerReady(event) {
  let playButton = document.getElementById("play");
  let el = document.getElementsByClassName("youtube-wrap");
  playButton.addEventListener("click", function () {
    player.playVideo();
    playButton.style.display ="none";
    el[0].classList.add("pv");
  });
}