The PageLines Customize plugin allows you to make any change you need to without editing the core framework. This way when the PageLines 2.0 framework gets updated, you won’t have to worry about losing any custom changes you’ve made. Many of you upgrading from PlatformPro will remember using the Base child theme to add your custom code. In PageLines 2.0, the PageLines Customize plugin does the same thing.
There are two main files in the PageLines Customize plugin for editing: base.css & functions.php.
Editing the style.css file, you can apply custom CSS to your theme.
Editing the functions.php file, that you can add pretty much anything else.
functions.phpfile that can be edited to include all of your custom CSS rules. In addition to style.css, the plugin also installs
The "Custom CSS" section is a simple quick way to add custom styles to your current site design.
The PageLines Customize plugin is a more comprehensive way to customize your theme. It is a way to create child themes for your site through the plugin to add CSS but also functions, hooks and anything you want to customize your site.