Siteorigin is the fantastic plugin, that adds a drag & drop page builder to your WordPress theme. It gives you the tools you need to be able to create complex page layouts without touching a single line of code. Read more at here
When editing a widget, on the right of the interface always shows a Widget Styles column consisting of Attributes, Layout, Design to help you configure for this widget.
Widget Class: a CSS class.
CSS Styles: CSS Styles, given as one per row.
Padding: Padding around the entire row.
Background Color: select Background color of the row.
Background Image: select Background image of the row.
Background Image Display: how the background image is displayed.
Border Color: Border color of the row.
Font Color: Color of text inside this widget.