koel/resources/assets/js/components/ui/SoundBar.vue

<template>
  <div class="bars" data-testid="soundbars">
    <img alt="Sound bars" height="13" src="@/../img/bars.gif">
  </div>
</template>

<style lang="scss" scoped>
.bars {
  width: 28px;
  height: 13px;
  position: relative;
  display: inline-block;
  backface-visibility: hidden;
  margin-bottom: 5px;
}
</style>