textual/docs/examples/widgets/progress_bar_styled.tcss

Bar > .bar--indeterminate {
    color: $primary;
    background: $secondary;
}

Bar > .bar--bar {
    color: $primary;
    background: $primary 30%;
}

Bar > .bar--complete {
    color: $error;
}

PercentageStatus {
    text-style: reverse;
    color: $secondary;
}

ETAStatus {
    text-style: underline;
}