css

.video-container {

  position: relative;

  width: 597px;

  height: 800px;

  padding-bottom: 100%;

}

video-container video {

  position: absolute;

  top: 0;

  left: 0;

  width: 597px;

  height: 800px;

  object-fit: contain;

}

#chatbot-container {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}