body,
html {
  margin: 0;
  background-color: black;
}

.background-image-container {
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  z-index: 999;
}

.background-image-container img {
  width: 100%;
  display: none;
}

.background-image-container video {
  width: 100%;
  display: block;
}

@media only screen and (max-width: 1140px) {
  .background-image-container img {
    margin-top: 6em;
  }

  .background-image-container video {
    margin-top: 6em;
  }
}