.mobile-music-player {
  display: none;
}

@media (max-width: 767px) {
  .mobile-music-player.is-visible {
    display: block;
    position: fixed;
    left: 12px;
    bottom: 12px;
    width: 298px;
    max-width: calc(100vw - 24px);
    height: 52px;
    z-index: 900;
    overflow: hidden;
    border-radius: 4px;
    box-shadow: 0 4px 14px rgba(0, 0, 0, .18);
  }

  .mobile-music-player iframe {
    display: block;
    width: 298px;
    max-width: 100%;
    height: 52px;
  }
}