@keyframes words {
  0%,
  20% {
    content: "PHP";
  }
  21%,
  40% {
    content: "Laravel";
  }
  41%,
  60% {
    content: "MySQL";
  }
  61%,
  80% {
    content: "JavaScript";
  }
  81%,
  100% {
    content: "WordPress";
  }
}