Twitter Bootstrap - changing height of checkboxes in form - css

Question

I have a simple HTML form that uses the Twitter Bootstrap framework (v3.1.1). On the smartphone/iPhone these checkboxes are quite small and hard to select with your finger. I would like to make them larger/more spaced out so they are easier to hit but haven't found a way so far - is this even possible.
Here's my form html:
<div class="container">
<div>
<p>Tick all that apply:</p>
<form role="form" action="continue.php" method="post">
<input type="hidden" name="selectionID" value="4567">
<div class="checkbox">
<label>
<input type="checkbox" name="selection[]" value="Fever/Temperature">Apples<br>
<input type="checkbox" name="selection[]" value="Swelling or redness at injection site">Oranges<br>
<input type="checkbox" name="selection[]" value="Pain at injection site">Bananas<br>
<input type="checkbox" name="selection[]" value="Tired/Fatigued">Pears<br>
<input type="checkbox" name="selection[]" value="Irritable">Mangoes<br>
<input type="checkbox" name="selection[]" value="Sleep pattern change">Watermelon<br>
<input type="checkbox" name="selection[]" value="Other">Other<br>
</label>
</div>
<button type="submit" class="btn btn-primary">Next</button>
</form>
</div>
</div>
I've also setup a jsfiddle here

Answer 1

This isn't easy to do cross-broswer .. check out the study made here: http://www.456bereastreet.com/lab/form_controls/checkboxes/
Also, make sure you're using correct HTML code. You should wrap each of your checkboxes with label, like this:
<div class="checkbox">
<label>
<input type="checkbox" name="selection[]" value="Fever/Temperature" />Apples<br/>
</label>
<label>
<input type="checkbox" name="selection[]" value="Swelling or redness at injection site" />Oranges<br/>
</label>
<label>
<input type="checkbox" name="selection[]" value="Pain at injection site" />Bananas<br/>
</label>
<!-- etc. -->
</div>