How can I allign check boxes vertically ?

How can I allign check boxes vertically:

http://www.yardstudio.eu/printscreens/Image_001_2014-06-03_15-01-31.png

http://www.sadarch.sk/zahradnicke-sluzby-v-banskej-bystrici/

<p>Vaše meno (povinné)
    [text* your-name] </p>

<p>Váš email (povinné)
    [email* your-email] </p>

Mám záujem o
[checkbox checkbox-847 "Test 1" "Test 2"]

<p>Predmet
    [text your-subject] </p>

<p>Vaša správa
    [textarea your-message] </p>

<p>[submit "Odošli"]</p>

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