You can design form field in this section.

Label Style->

1. Color – Change field label color.

2. Font – Change label font size

Field Style->

1. Background:

You can set field background color, background filter on this section. There have many kinds of background filter like Blur, Brightness, Contrast, Grayscale, Invert, Opacity, Sepia, Saturate. 

2. Color: Customize field text, placeholder color.

3. Font: Customize placeholder font size.

2. Border:

In this step you can set  border color, width, radius.There have different types of border.Such as solid, dotted, dashed,double. 

3. Padding:

By Padding properties you can generate space around of content.

4. Margin :

By Margin properties you can generate space around of background.

5. Shadow:

You can set field shadow by  using this property.