.parent {
  position: relative;
  width: 100%;
  height: 100%;
}

.login_container {
  width: 400px;
  margin: auto;
  position: absolute;
  top: 0;
  right: 0;
  z-index: 2;
}

.bottom_image {
  position: absolute;
  width: 100%;
  height: 100%;
  bottom: 0;
  left: 0;
}

.center {
  display: block;
  margin-left: auto;
  margin-right: auto;
  width: 50%;
}