jellyfin-web/dashboard-ui/css/icons.css

.ui-icon-remote:after {
    background-image: url("images/icons/remote.png");
}
/* Fallback */
.ui-nosvg .ui-icon-remote:after {
    background-image: url("images/icons/remote.png");
}

.ui-icon-play:after {
    background-image: url("images/icons/play.png");
}
/* Fallback */
.ui-nosvg .ui-icon-play:after {
    background-image: url("images/icons/play.png");
}

.ui-icon-stop:after {
    background-image: url("images/icons/stop.png");
}
/* Fallback */
.ui-nosvg .ui-icon-stop:after {
    background-image: url("images/icons/stop.png");
}

.ui-icon-pause:after {
    background-image: url("images/icons/pause.png");
}
/* Fallback */
.ui-nosvg .ui-icon-pause:after {
    background-image: url("images/icons/pause.png");
}
.ui-icon-volume-off:after {
    background-image: url("images/icons/mute.png");
}
/* Fallback */
.ui-nosvg .ui-icon-volume-off:after {
    background-image: url("images/icons/mute.png");
}

.ui-icon-volume-up:after {
    background-image: url("images/icons/volumeup.png");
}
/* Fallback */
.ui-nosvg .ui-icon-volume-up:after {
    background-image: url("images/icons/volumeup.png");
}
.ui-icon-volume-down:after {
    background-image: url("images/icons/volumedown.png");
}
/* Fallback */
.ui-nosvg .ui-icon-volume-down:after {
    background-image: url("images/icons/volumedown.png");
}
.ui-icon-previous-track:after {
    background-image: url("images/icons/previoustrack.png");
}
/* Fallback */
.ui-nosvg .ui-icon-previous-track:after {
    background-image: url("images/icons/previoustrack.png");
}
.ui-icon-next-track:after {
    background-image: url("images/icons/nexttrack.png");
}
/* Fallback */
.ui-nosvg .ui-icon-next-track:after {
    background-image: url("images/icons/nexttrack.png");
}
.ui-icon-sort:after {
    background-image: url("images/icons/sort.png");
}
/* Fallback */
.ui-nosvg .ui-icon-sort:after {
    background-image: url("images/icons/sort.png");
}
.ui-icon-filter:after {
    background-image: url("images/icons/filter.png");
}
/* Fallback */
.ui-nosvg .ui-icon-filter:after {
    background-image: url("images/icons/filter.png");
}