textual/docs/examples/styles/min_height.tcss

Horizontal {
    height: 100%;
    width: 100%;
    overflow-y: auto;
}

Placeholder {
    width: 1fr;
    height: 50%;
}

#p1 {
    min-height: 25%;  /* (1)! */
}

#p2 {
    min-height: 75%;
}

#p3 {
    min-height: 30;
}

#p4 {
    min-height: 40w;
}