This is from the FAQ:
1. When you are entering the shortcode or calling the plugin function from PHP, instead of using one of the built-in color names (“button-emerald”, “button-facebook” etc), use the class name you want to use. Ex: “bluegreen”
Do not add the “button-” prefix. This will be added automatically by the plugin. The resulting class name will be button-whatever you typed.
In this example, the custom CSS class will be button-bluegreen.
2. Go to the plugin settings page. There is a textarea there where you enter the CSS you want to use.
If you need help writing the CSS, look at the existing CSS file the plugin uses (filename: standout-css3-buttons.css in the /css/ subfolder) as a model for what CSS you need. Then just change the color values accordingly and paste it into the textarea. If you want to do something above and beyond what is already in the CSS, please search the web to find help. Please don’t use the plugin support forum to ask for CSS help unless there is an issue with the existing CSS.
The custom CSS stylesheet will be properly enqueued on pages where custom CSS class names are used.
