How can I create a custom style for the petition form?

First, select “None” as your theme on the Settings screen. Then add a ‘petition.css’ file to your theme folder. You can use the styles included in the plugin’s CSS folder as a starting point for your custom theme — just copy the contents of ‘theme-standard.css’ or ‘theme-basic.css’ into your ‘petition.css’ file and make any modifications you desire.

Custom styles can also be created for the widget and signaturelists by adding petition-widget.css or petition-signaturelist.css to your theme and changing the theme for these items to “None”.