er-audio-player">
  <template>

    <style>

      :host {
        display: block;
        /*margin: auto 10px;
        width: 100%;*/
        box-sizing: border-box;
        font-family: 'Roboto Mono', 'Helvetica Neue', Arial, sans-serif;
      }

      [hidden] {
        display: none !important;
      }

      #wrapper {
        position: relative;
        cursor: pointer;
        height: 50px;
        box-shadow: 0 1px 2px rgba(0,0,0,.3);
      }

      #left,
      #right {
        height: 50px;
      