.startup-videoheader {
    position: relative;
    overflow: hidden; 
}

#myVideo {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -100;
  pointer-events: none;
  border: none;
}

.video-container {
  position: absolute;
  top: 0;
  left: 0;
  overflow: hidden;
  width: 100vw;
  height: 100vh;
  z-index: -100;
}

.video-container iframe {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 177.78vh; /* 100vh * (16 / 9) */
  height: 100vh;
  transform: translate(-50%, -50%);
  pointer-events: none;
}