.youtube-video-wrap {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, .4);
  z-index: 9999;
}

.youtube-video-container {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 90%;
  max-width: 900px;
}

.youtube-video-inner {
  position: relative;
  height: 0;
  padding-top: 66.66%;
}

.youtube-video-inner iframe {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}