:root {
    font-size: 62.5%;
}

body {
    background: #000000;
    text-align:center;
}

.cli {
    border-radius: 1rem;
    padding: 3rem;
    margin: 20rem auto 3rem;
    font: 1.5rem consolas,monospaced;
    text-align: left;
    color:lime;
    border: 2px solid lime;
    letter-spacing: .5px;
    max-width: 500px;
    cursor:pointer;
}
.cmd:after {
  content: "";
  display:inline-block;
  width:1.2rem;
  height:2.5rem;
  margin-left: 1.5rem;
  margin-bottom: -.3rem;
  background:lime;
  animation: flash 2s infinite linear;
}

@-webkit-keyframes flash{
  0%,
  50%,
  100%{opacity:1}
  
  25%,
  75%{opacity:0}
}