스크립트 & 소스코드 공유

* {
  box-sizing: border-box;
}

.video-background {
  background: #000;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  z-index: -99;
}

.video-foreground,
.video-background iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

#vidtop-content {
  top: 0;
  color: #fff;
}

.vid-info {
  position: absolute;
  top: 0;
  right: 0;
  width: 33%;
  background: rgba(0, 0, 0, 0.3);
  color: #fff;
  padding: 1rem;
  font-family: Avenir, Helvetica, sans-serif;
}

.vid-info h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-top: 0;
  line-height: 1.2;
}

.vid-info a {
  display: block;
  color: #fff;
  text-decoration: none;
  background: rgba(0, 0, 0, 0.5);
  transition: .6s background;
  border-bottom: none;
  margin: 1rem auto;
  text-align: center;
}

@media (min-aspect-ratio: 16/9) {
  .video-foreground {
    height: 300%;
    top: -100%;
  }
}

@media (max-aspect-ratio: 16/9) {
  .video-foreground {
    width: 300%;
    left: -100%;
  }
}

@media all and (max-width: 600px) {
  .vid-info {
    width: 50%;
    padding: .5rem;
  }

  .vid-info h1 {
    margin-bottom: .2rem;
  }
}

@media all and (max-width: 500px) {
  .vid-info .acronym {
    display: none;
  }
}

<div class="video-background">
  <div class="video-foreground">
    <iframe class="ww" src="https://www.youtube-nocookie.com/embed/n0AY4ebPy4w?autoplay=1&loop=1&controls=0&vq=hd720"
      frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture"
      allowfullscreen></iframe>
  </div>
</div>
<div id="vidtop-content">
  <div class="vid-info">
    <h1>YouTube</h1>
    <p>Good!</p>
  </div>
</div>