textual/docs/examples/guide/screens/modal01.css

#dialog {
    grid-size: 2;
    grid-gutter: 1 2;
    padding: 1 2;
}

#question {
    column-span: 2;
    content-align: center bottom;
    width: 100%;
    height: 100%;
}

Button {
    width: 100%;
}