css动画 语音播放小喇叭效果

html
<div class="voice">
  <div class="bg voicePlay"></div>
</div>

css
.voice{
  padding-top: 12px;
  padding-left: 10px;
  margin: 100px auto;
  height: 35px;
  width: 150px;
  background: #1bbc9b;
  border-radius: 0 7px 7px;
}
 
.bg {
  background:url(data:image/png;base64,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) right 0 no-repeat;
    width: 24px;
    height: 24px;
  background-size: 400%;
}
 
.voicePlay {
  animation-name: voicePlay;
  animation-duration: 1s;
  animation-direction: normal;
  animation-iteration-count: infinite;
  animation-timing-function: steps(3);
}
 
@keyframes voicePlay {
  0% {
    background-position: 0;
  }
  100% {
    background-position: 100%;
  }
}