body {
  background: #222;
  color: lime;
  font-family: monospace;
}

#header {
  display: flex;
  align-items: baseline;
  margin: 15px;
}

/* blinking cursor 
#cursor {
  background: lime;
  line-height: 2px;
  margin-left: 3px;
  -webkit-animation: blink 0.8s infinite;
  width: 3px;
  height: 3px;
}
*/

#cursor {
  -webkit-animation: blink 0.8s infinite;
}

@-webkit-keyframes blink {
  0% {
    color: #222;
  }
  50% {
    color: lime;
  }
  100% {
    color: #222;
  }
}