#login_wrapper {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
}
.btn.btn-success.register-btn {
  line-height: 5vw;
  font-size: 2vw;
  box-shadow: none;
  -webkit-box-shadow: none;
}
@media all and (orientation:landscape) {
  .login-row {
    display: flex; justify-content: center; align-items: center;
  }
}
.back_walk_through_link {
  font-size: 6vw;
  line-height: 8vw;
  position: absolute;
  top:0;
  left:2vw;
}

.back_walk_through_link a {
  color: #666;
}