testbed/Textualize__textual/docs/examples/guide/input/key03.css

Screen {
    layout: grid;
    grid-size: 2 2;
    grid-columns: 1fr;
}

KeyLogger {  
    border: blank;
}

KeyLogger:hover {
    border: wide $secondary;
}

KeyLogger:focus {
    border: wide $accent;
}