WordPress Opt-in Plugin Customization

Hey, So I am building a new website using the official infusionsoft opt-in plugin. The problem is that I am trying to customize it to fit directly underneath the main slider on the homepage. This is a very common design concept but for some reason the plugin does not allow just the bar by itself. It must have a header. Can someone help me perhaps with some custom CSS to fix this?

Essentially I am trying to remove the outer header above: <div class="inf_infusionsoft_header_outer"> <div class="inf_infusionsoft_form_header inf_infusionsoft_header_text_dark">