JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container1 ">
  <div class="curtain1">
    <div class="ratio-keeper">
      <div class="wrap embed-youtube ">
        <div class="video embed-youtube  " data-id="djV11Xbc914">

        </div>

        <button class="playa " type="button" aria-label="Open"></button>
      </div>

    </div>

    <div class="exit"></div>
  </div>
</div>

<div class="container2 hide">
  <div class="container ">
    <div class="header hide">
      <div class="ratio-keeper2"></div>
    </div>
    <div class="curtain">
      <div class="ratio-keeper">

        <div class=" embed-youtube">
          <div class="video embed-youtube" data-id="djV11Xbc914">
          </div>
          <button class="playb embed-youtube-play" type="button" aria-label="Open"></button>
        </div>
      </div>
    </div>
    <div class="curtain">
      <div class="ratio-keeper">

        <div class=" embed-youtube">
          <div class="video embed-youtube" data-id="djV11Xbc914">
          </div>
          <button class="playc embed-youtube-play" type="button" aria-label="Open"></button>
        </div>
      </div>
    </div>
    <div class="curtain">
      <div class="ratio-keeper">

        <div class="embed-youtube">
          <div class="video embed-youtube" data-id="djV11Xbc914">
          </div>
          <button class="playd embed-youtube-play" type="button" aria-label="Open"></button>
        </div>
      </div>
    </div>
    <div class="curtain">
      <div class="ratio-keeper">

        <div class="embed-youtube">
          <div class="video embed-youtube" data-id="djV11Xbc914">
          </div>
          <button class="playe embed-youtube-play" type="button" aria-label="Open"></button>
        </div>
      </div>
    </div>
    <div class="curtain">
      <div class="ratio-keeper">

        <div class="embed-youtube">
          <div class="video embed-youtube" data-id="djV11Xbc914">
          </div>
          <button class="playf embed-youtube-play" type="button"...

CSS

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}


body {
  background: #302b63;

}
.container1 {
  position: absolute;
  left: 0;
  right: 0;
  min-height: 100%;
  min-width: 255px;
  display: flex;
  padding: 8px 8px;
}

.curtain1 {
  flex: 1 0 0;
  margin: auto;
  max-width: 640px;
  border: 21px solid;
  border-radius: 12px;
  border-color: #000 #101010 #000 #101010;
  position: relative;

}

.curtain1::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border: 1px solid;
  border-color: #000 #101010 #000 #101010;
  ;
}

.curtain1::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  outline: 1px solid #f91f6e;
  pointer-events: none;
}


.container {
  position: absolute;
  left: 0;
  right: 0;
  min-height: 100%;
  padding: 8px 8px;
}

.curtain {
  margin: auto auto 20px;
  max-width: 640px;
  border: 21px solid;
  border-radius: 12px;
  border-color: #000 #101010 #000 #101010;
  position: relative;
}

@media screen and (max-width: 500px) { .curtain { margin-bottom: 10px; } }

.curtain::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: #0a0a0a;
  border: 1px solid;
  border-color: #000 #101010 #000 #101010;
}

.curtain::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  top: 0;
  outline: 1px solid #333;
  pointer-events: none;
}

.ratio-keeper {
  position: relative;
  height: 0;
  padding-top: 56.25%;
  margin: auto;
  overflow: hidden;
}

/*.embed-youtube img,*/
.embed-youtube iframe,
.embed-youtube .embed-youtube-play,
.embed-youtube .embed-youtube-play:before {
  position: absolute;
}

.embed-youtube iframe {
  height: 100%;
  width: 100%;
  top: 0;
  left: 0;
  /*animation: fadein 3s ease-in 0s forwards;*/

}

.embed-youtube .embed-youtube-play   {
  -webkit-appearance: none;
  appearance: none;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
...

JavaScript

(function manageCover1() {

  function show(el) {
    el.classList.remove("hide");
  }

  function hide(el) {
    el.classList.add("hide");
  }

  function coverClickHandler() {
    //const cover = evt.currentTarget;
    const cover = document.querySelector(".container1");
    hide(cover);
    const thewrap = document.querySelector(".container2");
    show(thewrap);
  }
  const cover = document.querySelector(".exit");
  cover.addEventListener("click", coverClickHandler);
}());

const manageCover = (function makeManageCover() {

  function addCoverHandler(coverSelector, handler) {
    const cover = document.querySelector(coverSelector);
    //cover.addEventListener("click", handler);
    handler();
  }

  return {
    addCoverHandler
  };
}());

const videoPlayer = (function makeVideoPlayer() {

  let player;

  const tag = document.createElement("script");
  tag.src = "https://www.youtube.com/player_api";
  const firstScriptTag = document.getElementsByTagName("script")[0];
  firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

  function shufflePlaylist(player) {
    player.setShuffle(true);
    player.playVideoAt(0);
    //player.stopVideo();
  }

  function onPlayerReady(event) {
    player = event.target;
    player.setVolume(100);
    //shufflePlaylist(player);
  }

  function onPlayerStateChange(event) {
    const player = event.target;
    return player;
  }


  function addPlayer(video, playerOptions) {
    playerOptions.videoId = playerOptions.videoId || video.dataset.id;
    playerOptions.events = playerOptions.events || {};
    playerOptions.events.onReady = onPlayerReady;
    playerOptions.events.onStateChange = onPlayerStateChange;
  

    const player = new YT.Player(video, playerOptions);
    return player;
  }

  return {
    addPlayer
  };
}());

const managePlayer = (function makeManagePlayer() {

  const playerVars = {
    autoplay: 0,
    controls: 1,
    disablekb: 1,
    // enablejsapi: 1,
    //loop: 1,
    //playlist: 1,
    fs:...