Screen {
    layout: horizontal;    
}
Label {
    width: 1fr;
}    
#lbl1 {
    background: red 30%;
    text-style: bold;
}
#lbl2 {
    background: green 30%;
    text-style: italic;
}
#lbl3 {
    background: blue 30%;
    text-style: reverse;
}