If you are using the ActiveDEMAND Wordpress Plugin with the API Key entered, you can select the checkbox to "Use Theme CSS for ActiveDEMAND forms". This will allow you to style the forms in WordPress rather than ActiveDEMAND.
Multi Account Configuration
If you have multiple accounts using the same domain and have selected "This is a multi account website" in the plugin, you will not see the option to "Use Theme CSS for ActiveDEMAND forms".
In this case, you can add the following code to the form when you embed the div: