.overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
}

.logo {
  width: 200px;
  margin-bottom: 100px;
}

@media only screen and (max-width: 600px) {
  .logo {
    width: 400px;
    margin-bottom: 100px;
  }
}