css glow animation! (from w3 schools)

glow.css

/* code blocks */
code{
    color: white;
    -webkit-animation: glow 1s ease-in-out infinite alternate;
    -moz-animation: glow 1s ease-in-out infinite alternate;
    animation: glow 1s ease-in-out infinite alternate;
}

pre {
    background-color: #222;
    border-radius: 12px;
    padding: 4px 8px ;
    overflow-x: auto;
}

/* slightly edited glow animation from w3schools ;)*/
@-webkit-keyframes glow {
  from {
    text-shadow: 0 0 1px #fff, 0 0 2px #fff, 0 0 3px #e60073, 0 0 4px #e60073, 0 0 5px #e60073, 0 0 6px #e60073, 0 0 7px #e60073;
  }
  to {
    text-shadow: 0 0 2px #fff, 0 0 3px #ff4da6, 0 0 4px #ff4da6, 0 0 5px #ff4da6, 0 0 6px #ff4da6, 0 0 7px #ff4da6, 0 0 8px #ff4da6, 0 0 9px #ff4da6,  0 0 10px #ff4da6,  0 0 11px #ff4da6,  0 0 12px #ff4da6;
  }
}