textual/docs/examples/styles/color.tcss

Label {
    height: 1fr;
    content-align: center middle;
    width: 100%;
}

#label1 {
    color: red;
}

#label2 {
    color: rgb(0, 255, 0);
}

#label3 {
    color: hsl(240, 100%, 50%);
}