<p class="entrada">Hola, soy Alex</p>
.entrada {
  overflow: hidden;
  font-family: Helvetica, sans-serif;
  white-space: nowrap;
  font-size: 3.4em;
  color: #f13b3b;
  width: 350px;
  border-right: 2px solid rgba(0, 0, 0, 0.87);
  animation: animacionIntro 2.8s steps(23, end),
    animacionBar 1s step-end infinite;
}

@keyframes animacionIntro {
  0% {
    width: 0;
  }
  100% {
    width: 350px;
  }
}

@keyframes animacionBar {
  0%,
  100% {
    border-color: rgba(241, 59, 59, 0);
  }
  50% {
    border-color: rgba(241, 59, 59, 0.87);
  }
}

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