button.so-sound-button {
  -webkit-appearance: none;
  appearance: none;
  display: inline-flex;
  width: var(--so-sound-width, 140px);
  max-width: 100%;
  margin: 0;
  padding: 0;
  border: 0;
  background: transparent !important;
  background-color: transparent !important;
  background-image: none !important;
  border-radius: 0;
  box-shadow: none !important;
  line-height: 0;
  cursor: pointer;
  opacity: 0 !important;
  transform: translate3d(0, var(--so-sound-start-y, -3px), 0) !important;
  will-change: opacity, transform;
  transition:
    opacity var(--so-sound-duration, 550ms) ease-out,
    transform var(--so-sound-duration, 550ms) cubic-bezier(.22, 1, .36, 1);
}

button.so-sound-button:hover,
button.so-sound-button:focus,
button.so-sound-button:active {
  background: transparent !important;
  background-color: transparent !important;
  background-image: none !important;
  border-color: transparent !important;
  box-shadow: none !important;
}

button.so-sound-button.is-loaded {
  opacity: 1 !important;
  transform: translate3d(0, 0, 0) !important;
  will-change: auto;
}

button.so-sound-button:not(.is-loaded):hover,
button.so-sound-button:not(.is-loaded):focus,
button.so-sound-button:not(.is-loaded):active {
  opacity: 0 !important;
  transform: translate3d(0, var(--so-sound-start-y, -3px), 0) !important;
}

button.so-sound-button img {
  display: block;
  width: 100%;
  height: auto;
}

button.so-sound-button:focus-visible {
  outline: 3px solid currentColor;
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  button.so-sound-button {
    transform: none !important;
    transition: none;
  }
}

/* The aligned glow overlays the default image without moving the logo. */
button.so-sound-button {
  position: relative;
}

button.so-sound-button img.so-sound-idle-glow {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  pointer-events: none;
}