body{
 background-color: #13274F;
}
.clock {
  font-size: 80px;
  color: #72A0C1;
  text-align: center;
  -webkit-animation: clock 1s ease-in-out infinite alternate;
  -moz-animation: clock 1s ease-in-out infinite alternate;
  animation: clock 1s ease-in-out infinite alternate;
}
@-webkit-keyframes clock {
  from {
    text-shadow: 0 0 10px #5072A7, 0 0 20px #7CB9E8, 0 0 30px #7CB9E8, 0 0 40px #7CB9E8, 0 0 50px #7CB9E8, 0 0 60px #7CB9E8, 0 0 70px #7CB9E8;
  }
  
  to {
    text-shadow: 0 0 20px #72A0C1, 0 0 30px #7CB9E8, 0 0 40px #6CB4EE, 0 0 50px #6CB4EE, 0 0 60px #6CB4EE, 0 0 70px #6CB4EE, 0 0 80px #6CB4EE;
  }
}