body {
  background-color: #000000;
  background-image: radial-gradient(ellipse at bottom, rgba(120, 120, 120, .85), black 130%);
  height: 100vh;
  margin: 0;
  overflow: hidden;
}
.code{
  text-align: left;
  white-space: nowrap;
  font: 3.5vw 'Courier', monospace;
  text-shadow: 0 0 .3vw #a8f8a8;
  color: #3ddd3d;
  width:90vw;
  margin:5vw;
}
.b {
animation: blinker 1s step-start infinite;
}
@keyframes blinker {
50% {
  opacity: 0;
}
}