jqtransform Drop down loses CSS properties if I add multiple="true" to the Select Inputy Element

jqtransform Drop down loses CSS properties if I add multiple="true" to the Select Inputy Element

A site I'm working on uses JQTransform.
I need to change the option of a drop down list to allow the user to select multiple options from the list.
When I add multiple="true"
As in:
<select name="example[]" id="example[]" multiple="true" >
 
I lose all the css properties of the drop down box.
 
Is there a work around for this?  I googled for a solution but came up empty.....