Checkboxes on a line ?

Hi.

I have made a rather simpel contact form, where i use checkbox option.

There is quit a few options and instead of them standing under each other i would like to have them in 4×3 cells.

I have searched and searched but have found nothing 🙁
( Online something css based, but it did not work )

This is my contact form

<fieldset>
<legend>Online tilbud</legend>

1. Dit navn [text cf7s-name]
2. Telefonnummer [tel cf7s-phone]
3. Email [email* cf7s-email]
4. Jeg vil gerne vide mere om [checkbox cf7s-checkbox1 “Nyt tag” “Tagsten” “Tag renovering” “Nye vinduer & døre” “Køkken montering” “Nybyggeri” “Ombygning” “Byggepladsservice” “Asbest m.m. sanering” “Energi tjek” “Efter isolering” “Skadesservice” “Andet”]
5. Bemærkninger [textarea cf7s-comments]

[submit “Send”]
<p>* krævet</p>
</fieldset>

Can any one help me in the right direction ?

https://wordpress.org/plugins/contact-form-7/