.sound-toggle {
  position: fixed;
  z-index: 21;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: grid;
  place-items: center;
  min-width: 100px;
  min-height: 44px;
  padding: 8px 12px;
  color: var(--paper);
  mix-blend-mode: difference;
  font: 600 10px var(--sans);
  letter-spacing: .15em;
  white-space: nowrap;
}
.sound-toggle::after {
  content: '';
  position: absolute;
  right: 12px;
  bottom: 7px;
  left: 12px;
  height: 1px;
  background: currentColor;
  opacity: .42;
}
.sound-toggle[hidden] { display: none; }
@media (max-width: 767px) {
  .sound-toggle { top: 9px; min-width: 90px; font-size: 9px; letter-spacing: .1em; }
}