.left {
  position: absolute;
  width: 50%;
  top: 0;
  bottom: 0;
  height: 100%;
  z-index: 1;
  left: 0;

}

.right {
  position: absolute;
  width: 50%;
  top: 0;
  bottom: 0;
  height: 100%;
  z-index: 1;
  right: 0;

}