[data-instruments] {
  height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center; }
  [data-instruments] [data-stop] {
    display: none; }
  [data-instruments].playing [data-stop] {
    display: inline-block; }
  [data-instruments].playing [data-play] {
    display: none; }