gecko-dev/toolkit/themes/shared/narrate.css

/* Avoid adding ID selector rules in this style sheet, since they could
 * inadvertently match elements in the article content. */

.narrating {
  position: relative;
  z-index: 1;
}

body.light .narrating {
  background-color: #ffc;
}

body.sepia .narrating {
  background-color: #e0d7c5;
}

body.dark .narrating {
  background-color: #242424;
}

.narrate-word-highlight {
  position: absolute;
  display: none;
  transform: translate(-50%, calc(-50% - 2px));
  z-index: -1;
  border-bottom-style: solid;
  border-bottom-width: 7px;
  transition: left 0.1s ease, width 0.1s ease;
}

.narrating > .narrate-word-highlight {
  display: inline-block;
}

.narrate-word-highlight.newline {
  transition: none;
}

body.light .narrate-word-highlight {
  border-bottom-color: #ffe087;
}

body.sepia .narrate-word-highlight {
  border-bottom-color: #bdb5a5;
}

body.dark .narrate-word-highlight {
  border-bottom-color: #6f6f6f;
}

.narrate-dropdown {
  --border-color: #e5e5e5;
}

.narrate-toggle {
  margin: 0;
  background-image: url("chrome://global/skin/narrate/waveform.svg");
}

.speaking .narrate-toggle {
  /* This shows with an animation. */
  background-image: url("chrome://global/skin/narrate/waveform.svg#waveform");
}

.narrate-dropdown > .dropdown-popup button {
  background-color: transparent;
}

.narrate-dropdown > .dropdown-popup button:hover:not(:disabled) {
  background-color: #eaeaea;
}

.narrate-row {
  display: flex;
  align-items: center;
  min-height: 40px;
  box-sizing: border-box;
}

.narrate-row:not(:first-child) {
  border-top: 1px solid var(--border-color);
}

/* Control buttons */

.narrate-control > button {
  background-size: 24px 24px;
  background-repeat: no-repeat;
  background-position: center center;
  height: 64px;
  width: 100px;
  border: none;
  color: #666;
  box-sizing: border-box;
}

.narrate-control > button:not(:first-child) {
  border-left: 1px solid var(--border-color);
}

.narrate-skip-previous {
  border-top-left-radius: 3px;
  background-image: url("chrome://global/skin/narrate/back.svg");
  -moz-context-properties: fill;
  fill: rgb(128 128 128);
}

.narrate-skip-next {
  border-top-right-radius: 3px;
  background-image: url("chrome://global/skin/narrate/forward.svg");
  -moz-context-properties: fill;
  fill: rgb(128 128 128);
}

.narrate-skip-previous:disabled,
.narrate-skip-next:disabled {
  fill: rgb(128 128 128 / 50%);
}

.narrate-start-stop {
  background-image: url("chrome://global/skin/narrate/start.svg");
}

.narrate-dropdown.speaking .narrate-start-stop {
  background-image: url("chrome://global/skin/narrate/stop.svg");
}

/* Rate control */

.narrate-rate::before, .narrate-rate::after {
  content: '';
  width: 48px;
  height: 40px;
  background-position: center;
  background-repeat: no-repeat;
  background-size: 24px auto;
}

.narrate-rate::before {
  background-image: url("chrome://global/skin/narrate/slow.svg");
}

.narrate-rate::after {
  background-image: url("chrome://global/skin/narrate/fast.svg");
}

.narrate-rate-input {
  margin: 0 1px;
  flex-grow: 1;
}

.narrate-rate-input::-moz-range-track {
  background-color: #979797;
  height: 2px;
}

.narrate-rate-input::-moz-range-progress {
  background-color: #2EA3FF;
  height: 2px;
}

.narrate-rate-input::-moz-range-thumb {
  background-color: #808080;
  height: 16px;
  width: 16px;
  border-radius: 8px;
  border-width: 0;
}

.narrate-rate-input:active::-moz-range-thumb {
  background-color: #2EA3FF;
}

/* Voice selection */

.voiceselect {
  width: 100%;
}

.voiceselect > button.select-toggle,
.voiceselect > .options > button.option {
  -moz-appearance: none;
  border: none;
  width: 100%;
  min-height: 40px;
}

.voiceselect.open > button.select-toggle {
  border-bottom: 1px solid var(--border-color);
}

.voiceselect > button.select-toggle::after {
  content: '';
  background-image: url("chrome://global/skin/narrate/arrow.svg");
  background-position: center;
  background-repeat: no-repeat;
  background-size: 12px 12px;
  display: inline-block;
  width: 1.5em;
  height: 1em;
  vertical-align: middle;
}

.voiceselect > .options > button.option:not(:first-child) {
  border-top: 1px solid var(--border-color);
}

.voiceselect > .options > button.option  {
  box-sizing: border-box;
}

.voiceselect > .options:not(.hovering) > button.option:focus {
  background-color: #eaeaea;
}

.voiceselect > .options:not(.hovering) > button.option:hover:not(:focus) {
  background-color: transparent;
}

.voiceselect > .options > button.option::-moz-focus-inner {
  outline: none;
  border: 0;
}

.voiceselect > .options {
  display: none;
  overflow-y: auto;
}

.voiceselect.open > .options {
  display: block;
}

.current-voice {
  color: #7f7f7f;
}

.voiceselect:not(.open) > button,
.voiceselect .option:last-child {
  border-radius: 0 0 3px 3px;
}