Min-height

The min-height style sets a minimum height for a widget.

Syntax

min-height: <scalar>;

The min-height style accepts a <scalar> that defines a lower bound for the height of a widget. That is, the height of a widget is never allowed to be under min-height.

Example

The example below shows some placeholders with their height set to 50%. Then, we set min-height individually on each placeholder.

Outputmin_height.pymin_height.tcss

from textual.app import App
from textual.containers import Horizontal
from textual.widgets import Placeholder


class MinHeightApp(App):
    CSS_PATH = "min_height.tcss"

    def compose(self):
        yield Horizontal(
            Placeholder("min-height: 25%", id="p1"),
            Placeholder("min-height: 75%", id="p2"),
            Placeholder("min-height: 30", id="p3"),
            Placeholder("min-height: 40w", id="p4"),
        )


if __name__ == "__main__":
    app = MinHeightApp()
    app.run()

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;
}

1. This won't affect the placeholder because its height is larger than the minimum height.

CSS

/* Set the minimum height to 10 rows */
min-height: 10;

/* Set the minimum height to 25% of the viewport height */
min-height: 25vh;

Python

# Set the minimum height to 10 rows
widget.styles.min_height = 10

# Set the minimum height to 25% of the viewport height
widget.styles.min_height = "25vh"

See also

• max-height to set an upper bound on the height of a widget.
• height to set the height of a widget.