gecko/toolkit/themes/winstripe/global/media/videocontrols.css

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

.controlBar {
    height: 28px;
    background-color: rgba(35,31,32,0.74);
}

.playButton {
    background: url(chrome://global/skin/media/pauseButton.png) no-repeat center;
    /* Remove the native button appearance and styling */
    -moz-appearance: none;
    margin: 0px;
    padding: 0px;
    min-height: 28px;
    min-width: 28px;
    border: none;
}
.playButton[paused="true"] {
    background: url(chrome://global/skin/media/playButton.png) no-repeat center;
}

.muteButton {
    background: url(chrome://global/skin/media/muteButton.png) no-repeat center;
    /* Remove the native button appearance and styling */
    -moz-appearance: none;
    margin: 0px;
    padding: 0px;
    min-height: 28px;
    min-width: 33px;
    border: none;
}
.muteButton[muted="true"] {
    background: url(chrome://global/skin/media/unmuteButton.png) no-repeat center;
}

.backgroundBar {
    /* make bar 8px tall (control height = 28, minus 2 * 10 margin) */
    margin-top: 10px;
    margin-bottom: 10px;
    background-color: rgba(255,255,255,0.5);
    -moz-border-radius: 4px 4px;
}

.bufferBar, .progressBar {
    /* make bar 8px tall (control height = 28, minus 2 * 10 margin) */
    margin: 10px 0px 10px 0px;
    -moz-appearance: none;
    border: none;
    background-color: transparent;
    min-width: 0px;
    min-height: 0px;
}

/* .progress-bar is an element inside the <progressmeter> implementation. */
.bufferBar .progress-bar {
    /*
     * Note that this is drawn on top of the .backgroundBar. So although this
     * has the same background-color specified, the semitransparent
     * compositing gives it a different visual appearance.
     */
    background-color: rgba(255,255,255,0.5);
    -moz-border-radius: 4px 4px;
    -moz-appearance: none;
}

.progressBar .progress-bar {
    background-color: white;
    -moz-border-radius: 4px 4px;
    -moz-appearance: none;
}

/* .scale-slider is an element inside the <scale> implementation. */
.scale-slider {
    /* Hide the default horizontal bar. */
    -moz-appearance: none;
    background: none;
    margin: 0;
}

/* .scale-thumb is an element inside the <scale> implementation. */
.scale-thumb {
    /* Override the default thumb appearance with a custom image. */
    -moz-appearance: none;
    background: url(chrome://global/skin/media/scrubberThumb.png) no-repeat center;
    border: none;
    min-width: 11px;
    min-height: 20px;
}