This is a very slim piece of plugin that gives you incredible flexibility to apply your own CSS class(s) to any specific widget.
If this plugin is activated, it will present an additional ‘CSS Class’ field in every widget.
You can input any css class name or even more than one class name by separating each with a space.
If, somehow your widget is not wrapped inside an HTML block element (depends upon the theme you are
using), this plugin will intelligently wrap the widget with a DIV tag and apply to class to it.
This section describes how to install the plugin and get it working.