.glow:hover {
  animation: glow 1s ease-in-out infinite alternate;
}

@-webkit-keyframes glow {
  from {
    text-shadow: 0 0 10px #cb0000, 0 0 20px #cb0000, 0 0 30px #cb0000, 0 0 40px #cb0000, 0 0 50px #cb0000, 0 0 60px #cb0000, 0 0 70px #cb0000;
  }
  
  to {
    text-shadow: 0 0 20px #fff, 0 0 30px #930303, 0 0 40px #930303, 0 0 50px #930303, 0 0 60px #930303, 0 0 70px #930303, 0 0 80px #930303;
  }
}