Flexible Attributes in Free Addons automates an id for each attribute - essentially
<div class="wrapperAttribsOptions">
gets an id like
<div class="wrapperAttribsOptions" id="<?php echo $options_wrapper_id[$i];?>">
where $options_wrapper_id is set previously in attributes.php:
$options_wrapper_id[] = 'wAttrib-' . $products_options_names->fields['products_options_id'];

You can globally set styling for an attribute in all products where it appears, or in an individual product with a per-product stylesheet.