Styler for Ninja Forms is for users who want to style Ninja Forms without any CSS codin. It is built on WordPress Customizer that shows you live preview of design changes.
You can also preview you form design for different devices like desktops, tablets, mobiles directly from customize and give different font size and field widths for them.
It lets you style form wrapper, form title, input fields, textarea, checkboxes, radios, dropdown, submit button fields. You can change colors, font family, borders, paddings , margins etc with easy to use controls like color picker and sliders.