.main_title::after {
  content: "Strategy+ Business Lab";
  animation: main_title 5s infinite,
             main_title_content 15s infinite;
}

.subtitle:after {
  content: "Strategic about your future";
  animation: subtitle 5s infinite,
             subtitle_content 15s infinite;
}

@keyframes main_title_content {
  0%, 23% {
    content: "Strategy+ Business Lab";
  }
  33%, 56% {
    content: "Where the past present, and future";
  }
  66%, 90% {
    content: "Real companies";
  }
}

@keyframes subtitle_content {
  0%, 23% {
    content: "Strategic about your future";
  }
  33%, 56% {
    content: "of your business meet";
  }
  66%, 90% {
    content: "business cases";
  }
}