@keyframes glow {
 0% {
  color: #00f;
 }
 100% {
  color: #f00;
 }
}

.glow {
 font-family: calibri;
 font-size: 3vw;
 font-weight: bold;
 animation-name: glow;
 animation-duration: 1s;
 animation-direction: alternate;
 animation-iteration-count: infinite;
}