Please note: This website includes an accessibility system. Press Control-F11 to adjust the website to people with visual disabilities who are using a screen reader; Press Control-F10 to open an accessibility menu.
To remove the background image, go into the Customizer > Choose Background > Remove. For the space, you can remove the default Call to Action (Visual Editor) widget.
The “Call to Action” that comes with the Hydra theme is a visual editor widget. You should be able to access it from the Widgets section of the Customizer unless, perhaps, it was already removed?