Hi,
It sounds line a specifity issue. The style that targets the element may be carrying more weight than a simple class and will be over-ridden.
You will need to drill down to the element to add more weight to it assuming of course that this is the problem. If the div has an id or the parent has and id then use that to add weight to the class.
e.g.
Code:
#parent_id div.nobg {background:none;}
If all depends whether the original style has even more weight so you may need to drill back a level etc and your class carries more weight than the original.
If the id is in the same element. e.g.
Code:
<div id="coloured_bg" class="nobg">text</div>
Then you need to target it like so.
Code:
#coloured_bg.nobg {background:transparent}
Without any code to go on I can't give a specific example for your case
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