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Unfortunately it is currently not possible to change the style of the label. Please be noted that since all widgets are loaded in iFrame which is not accessible.
I am creating a feature request ticket and sending it to our back end team. We cannot provide you an ETA on this but we will get back to you as soon as we have any update from them.
"Custom CSS" parameter has been added to widget - it lets you style everything as you wish. If you don't see this param, please remove widget from form and add it again.