This is a frevvo theme.

The theme contains several files:

1) form.css is the place to do most of your customizations. This is used in Use Mode (as well as in the Designer to some extent).
   You can customize colors, borders, backgrounds, cursors etc. for frevvo form elements in here. 
   The CSS is commented to help you apply your changes in the right place.
   
2) form-edit.css is used only in the Form Designer. Typically, you will not need to make any changes here.

3) form-print.css is used for the Printable View.

4) custom.js: you can include your own custom Javascript in here. This file is automatically loaded when the form is loaded.

5) images: this directory contains images used for the borders and header of a popup form.
   For popup forms, the images are named useform_*.jpg. You can change these images to suit your needs.
   Note that popup forms have a 6px border.
   
   If this directory contains a header.png, popup forms will show the header. Note that the dimensions of the
   image must match the width of your forms.