spacing issue with Contact Form 7 Plugin Please Help?

Please help I am using contact form 7 it works great but when I add check boxes they all sit so close to each other side by side. I need to have four check boxes per row and I am pretty sure this could be done by setting the width between each check box using css to ensure this happens.

I have added the code below to my custom css to see if indeed the span.wpcf7-list-item works and it seems to with the code below however it just now makes them all go one under each other I need them spaced evenly so a maximum of four checkboxes would fit in one row.

Could anyone please supply me with the css to create the spacing for this please?

span.wpcf7-list-item {
margin-left: 0.5em;
display: block;
}

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