.v-center {
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

.screen {
  background: #fff;
}

.overlay img {
  margin-top: 50%;
}

.btn-black {
  background: #000;
  color: #fff;
}

.btn-black:hover {
  background: #fff;
  color: #000;
}