.typing {
  white-space: nowrap;
  overflow: hidden;
  border-right: 2px solid #fff; /* cursor */
  max-width: 0;
  animation: typing 2.5s steps(18) forwards; /* 18 caracteres no texto */
}

@keyframes typing {
  to {
    max-width: 18ch; /* igual ao número de caracteres */
  }
}