Change Checkbox size inside grid

Hi,
I try to change the size of the checkbox inside a grid with this code but with no success:

...
private Grid<Person> grid;
grid = new Grid<>();
...

 grid.addComponentColumn(person -> {
            Checkbox checkbox = new Checkbox();

            checkbox.setWidth("70px");
            checkbox.setHeight("70px");

            checkbox.setValue(person.isAnwesend());

            checkbox.addValueChangeListener(click -> {
                changeIsAnwesend(person);

            });

            return checkbox;
        })
                .setFlexGrow(0)
                .setWidth(UIUtils.COLUMN_WIDTH_XS);

same with:

checkbox.setMinHeight("70px");
checkbox.setMinWidth("70px");

any recomandation?
Thank you,

Hi,
I try to change the size of the checkbox inside a grid with this code but with no success:

...
private Grid<Person> grid;
grid = new Grid<>();
...

 grid.addComponentColumn(person -> {
            Checkbox checkbox = new Checkbox();

            checkbox.setWidth("70px");
            checkbox.setHeight("70px");

            checkbox.setValue(person.isAnwesend());

            checkbox.addValueChangeListener(click -> {
                changeIsAnwesend(person);

            });

            return checkbox;
        })
                .setFlexGrow(0)
                .setWidth(UIUtils.COLUMN_WIDTH_XS);

same with:

checkbox.setMinHeight("70px");
checkbox.setMinWidth("70px");

any recomandation?
Thank you,

the solution is:

checkbox.getStyle().set("font-size", "24px");