.audio-player {
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}
.audio-player i {
  font-size: 24vw;
}
#next-button {
    font-size: 18vw;
}

@media screen and (min-width:560px) {
  .audio-player i {
    font-size: 134px;
  }
  #next-button {
    font-size: 100px;
  }
}

#now-playing {
  display: none;
}

.progress {
  overflow: visible;
}

li.active:before {
  font-family: "Material Icons";
  content: "\e037";
  display: inline-block;
  padding-right: 3px;
  vertical-align: middle;
  font-size: 1.5rem;
}

.ui-slider-handle {
  border-radius: 50%;
}