Contact form 7, how to display checkbox in block.

Hi,

I know and have seen that by putting span.wpcf7-list-item { display: block; } in css stylesheet will make radio button or checkbox in block display or vertical alignment.
But this will fix all the questions answered by radio or checkbox..

What i want is that only specific question will make the checkbox in vertical alignment or block display.

Hope someone can help.

Thanks.