JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container1 ">
  <div class="curtain1">
    <div class="ratio-keeper">

      <div class="fence">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
        <div></div>
      </div>


      <div class="fan">
        <svg width="70%" height="70%" viewBox="76 130 381 381">
          <g id="fan">
            <path fill="#000" stroke="#000" d="m166.3352 168.6294c5.5396 2.4448 45.2339 54.394 72.7499 91.0151-9.1901-44.8757-21.7959-109.0279-19.9558-114.796 4.1462-12.9949 33.7039-13.5172 41.5845-13.7579 7.8827-.2415 37.4165-1.5221 42.3488 11.1948 2.1872 5.6436-6.4773 70.4506-12.9142 115.8007 25.2309-38.2323 61.6818-92.5089 67.0612-95.2865 12.119-6.2568 33.3898 14.2749 39.1337 19.6768 5.7424 5.402 27.5341 25.3815 22.0294 37.859-2.4441 5.5389-54.3954 45.2354-91.0172 72.7506 44.8757-9.1901 109.0293-21.7959 114.7974-19.9559 12.9927 4.1442 13.5193 33.7032 13.7586 41.5838.2422 7.8819 1.5221 37.4165-11.192 42.3473-5.6471 2.1894-70.4541-6.4765-115.8049-12.9127 38.2323 25.2323 92.5081 61.6783 95.2871 67.0605 6.2581 12.1175-14.2742 33.3877-19.6776 39.133-5.4027 5.7432-25.3815 27.5341-37.8563 22.0279-5.5396-2.4434-45.2361-54.3961-72.7534-91.0143 9.1901 44.8757 21.7952 109.0287 19.9551 114.7953-4.1434 12.9934-33.7026 13.5157-41.5852 13.7586-7.8799.24-37.4165 1.5221-42.3431-11.1936-2.1887-5.6464 6.4779-70.4541 12.9133-115.8071-25.2323 38.2323-61.6824 92.5124-67.0639 95.2908-12.1169 6.256-33.3891-14.2728-39.1337-19.6754-5.7432-5.4027-27.5313-25.383-22.0251-37.8578 2.4434-5.5396 54.394-45.2339 91.0136-72.7526-44.8764 9.1908-109.0266 21.7944-114.7967 19.9566-12.9934-4.1434-13.5171-33.7025-13.7586-41.5852-.2407-7.8806-1.5221-37.4165 11.1963-42.346 5.6443-2.1879 70.4498 6.4752 115.8 12.9121-38.233-25.2316-92.5081-61.6783-95.2865-67.0612-6.256-12.1169 14.2748-33.3913 19.6768-39.1337 5.4006-5.7438 25.3794-27.5333 37.8584-22.0272z" />
          </g>
        </svg>

     ...

CSS

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


body {
  background: #302b63;
}

.embed-youtube.activePlay .embed-youtube-play {
  display: none;
}

body.initial-fade {
  animation: initial-fade 1s ease forwards;
}

@keyframes initial-fade {
  0% {
    opacity: 1;
  }

  100% {
    opacity: 0;
    pointer-events: none;
  }
}

.container2 {
  display: none;
}

.container2.activeContainer  {
  display: flex;
}

.container1.activeContainer  {
 display: none;
}

body.bg1{
  animation: fadeInBody 5s ease 0s forwards;
  animation-delay: 0s;
  opacity: 0;
}

@keyframes fadeInBody {
  100% {
    opacity: 1;
  }
}




/*body.bg1 {
  animation: bg1 5s ease forwards;
}

@keyframes bg1 {
  0% {
    opacity: 0;
  }

  100% {
    opacity: 1;
    background: teal;
  }
}*/

iframe {
  display: block;
  animation: iframe 10s ease 2s forwards;
  animation-delay: 6s;
  opacity: 0;
}

@keyframes iframe {
  to {
    opacity: 1;
  }
}

.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;
  background: radial-gradient(circle, transparent 0% 35%, #0a0a0a 35%);

  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;
}

.curtain1.slide::after {
  outline: 1px solid #0059dd;
  transition: outline 2s ease-in;
  /*  add this */
  /*background-image: none;*/
}


.video-one {
  position: absolute;
  height: 100%;
  width: 100%;
  top: 0;
  transition: all 8s ease-in 0s;
  transition-delay: 300ms;
  background:...

JavaScript

const manageCover = (function makeManageCover() {

  function showCover(playButton) {
    const cover = playButton.parentElement;
    cover.classList.add("activePlay");
  }

  function openCurtain(curtain) {
    curtain.classList.add("slide");
  }

  function coverClickHandler(evt) {
    const cover = evt.currentTarget;
    showCover(cover);
    const curtain = evt.currentTarget.parentElement.parentElement.parentElement;
    openCurtain(curtain);
  }

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

  function addClickToButtons(playButtons) {
    playButtons.forEach(function playButtonHandler(playButton) {
      playButton.addEventListener("click", coverClickHandler);
    });
  }

  function init(selectors) {
    const playButtons = document.querySelectorAll(selectors.playButton);
    addClickToButtons(playButtons);
  }

  return {
    addCoverHandler,
    init
  };
}());

const manageUI = (function makeManageUI() {
  const body = document.body;

  function resetBackground(backgroundSelector) {
    const background = document.querySelector(backgroundSelector);
    background.classList.add("bg1");
  }

  function resetContainer(containerSelector) {
    const container = document.querySelector(containerSelector);
    container.classList.add("activeContainer");
  }

  function resetContainer(containerSelector) {
    const container = document.querySelector(containerSelector);
    container.classList.add("activeContainer");
  }

  function resetPage() {
    resetBackground("body");
    resetContainer(".container1");
    resetContainer(".container2");
  }

  function animationEndHandler(evt) {
    const animationName = evt.animationName;

    if (animationName === "initial-fade") {
      body.classList.remove("initial-fade");
      resetPage();
    }
  }

  function exitClickHandler() {
    body.classList.add('initial-fade');
  }

  function...