.circle__progress {
  fill: none;
  stroke-width: 3;
  stroke-opacity: 0.3;
  stroke-linecap: round;
}

.note-display:nth-child(1) .circle__progress { stroke: #AAFF00; }
.note-display:nth-child(2) .circle__progress { stroke: #FF00AA; }
.note-display:nth-child(3) .circle__progress { stroke: #AA00FF; }
.note-display:nth-child(4) .circle__progress { stroke: #00AAFF; }