body {
  background-color: #000000;
  text-align: center;
}

.zIndex1 {
  position: fixed;
  z-index: 1;
}

.zIndex2 {
  position: fixed;
  z-index: 2;
}

#mainContainer {
  height: 80vh;
  width: 80vw;
  margin: auto;
  text-align: center;
}