h1 {
  text-align: center;
}
.video {
  height: 85vh;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  display: block;
  margin-bottom: 30px;
}
#iframe-video {
  width: 100%;
  position: relative;
  left: 50%;
  transform: translateX(-50%);
}