Anki Audio Meter

gistfile1.txt

<!-- in the HTML -->

<div class="sentence1 shadow audio">
Playing ... &nbsp;
<span id="vu">
  <span class="bar"></span>
  <span class="bar"></span>
  <span class="bar"></span>
  <span class="bar"></span>
  <span class="bar"></span>
</span>
</div>

<!-- in the CSS -->

/* audio bars */

#vu {
  position: relative;
  height: 20px;
}

#vu span.bar {
  display: block;
  position: absolute;

  left: 0px;
  bottom: 6px;
  width: 9px;
  height: 5px;
  background: #666;
  animation: audio-wave 0.7s infinite ease-in-out;
}

#vu span.bar:nth-child(2) {
left: 11px;
height: 20px;
animation-delay: 0.1s;
animation-duration: 0.5s;
}

#vu span.bar:nth-child(3) {
left: 22px;
height: 15px;
animation-delay: 0.1s;
animation-duration: 1.0s;
}

#vu span.bar:nth-child(4) {
left: 33px;
height: 5px; 
animation-delay: 0.1s;
animation-duration: 0.8s;
}

#vu span.bar:nth-child(5) {
left: 44px;
height: 12px;
animation-delay: 0.15s;
animation-duration: 0.7s;
}


@keyframes audio-wave {
    0% { height:5px; transform:translateY(0px);}
    25% {height:20px;transform:translateY(0px);}
    50% {height:5px;transform:translateY(0px);}
    100% {height:5px;transform:translateY(0px);}
}