the code

<style>
  @keyframes console {
    0%{opacity:0;}
    25%{opacity:0}
    50%{opacity:0}
    75%{opacity:25}
    100%{opacity:100}
  }

  #underShidden {
    animation-name: console;
    animation-duration: 1s;
    animation-iteration-count: infinite;
  }
  #foook{
    font-family:'Lucida Sans Unicode' !important;
    text-shadow: -1px 0 #fff,0 1px #fff,1px 0 #fff,0 -1px #fff;
    color: #404040;
  }
</style>
<span id="foook"><span>X:/lighthex></span><span id="underShidden">_</span>