.audio-buttons {
  width: 150px;
}

button.recording, button.playing {
  border: solid 1px black;
}

button.recording, button.record {
  margin-right: 10px;
}

.audio-buttons {
  width: 150px;
}

button.recording, button.playing {
  border: solid 2px #2CAB6F;
}

button.recording, button.record {
  margin-right: 10px;
}

Change recording state's border to green
Change recording state's border to green
