I discovered this by accident while looking to customize the tooltip (popup message) box. It’s not advisable you edit the plugin files directly (so updates don’t overwrite your edits) so you’ll need to put the following in a stylesheet somewhere in your site:
For the normal one (ie non-hover):
div.wrc_pricing_table div.package_details div.icon_tooltip{
border-bottom:none;
}
And for the one appear on hover:
div.wrc_pricing_table div.package_details div.icon_tooltip:hover{
border-bottom:none;
}
But note that the lines were put there to signal a link to the user, which in this case presents the tooltip message. Removing this completely reduces the effectiveness of the tooltip feature, in my humble opinion.