.header__signup {
  background: linear-gradient(45deg, #913A99, #D861D6);
  box-shadow: 0 0 10px #913A99, 0 0 20px #913A99, 0 0 30px #D861D6;
  transition: all 0.3s ease-in-out;
}

.header__signup:hover {
  box-shadow: 0 0 15px #D861D6, 0 0 25px #D861D6, 0 0 35px #913A99;
  transform: scale(1.05);
}