.popup-content {
  /* other styles for da popup boyyyy */
  position: fixed;
  top: 50px; 
  left: 50%; 
  transform: translateX(-50%);
  z-index: 999; /* its a popup, blud is on top of the world ey */
  /* cool other styles for da popup */
}

#ad-container {
  position: relative;
  width: 100%;
  height: 500px;
  background-color: #f1f1f1;
  overflow: hidden;
}

#video-ad {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}