textual/docs/examples/styles/width_comparison.tcss

#cells {
    width: 9;      /* (1)! */
}
#percent {
    width: 12.5%;  /* (2)! */
}
#w {
    width: 10w;    /* (3)! */
}
#h {
    width: 25h;    /* (4)! */
}
#vw {
    width: 15vw;   /* (5)! */
}
#vh {
    width: 25vh;   /* (6)! */
}
#auto {
    width: auto;   /* (7)! */
}
#fr1 {
    width: 1fr;    /* (8)! */
}
#fr3 {
    width: 3fr;    /* (9)! */
}

Screen {
    layers: ruler;
}

Ruler {
    layer: ruler;
    dock: bottom;
    overflow: hidden;
    height: 1;
    background: $accent;
}