Hi Max,
Thanks for reaching out, sorry to hear you are having problems getting Callaway to show your desired background. Let’s start by seeing what site background is active in the Customizer. Navigate to Customizer > Background > Pattern & Color and click the Remove Selected Pattern button under the Background Pattern heading. Next you can click into the Background Color input above and select what background you’d like used on your website.
It looks like the on-page content is being created with Elementor, so if you want just a section of the page to have a black background, you will have to use Elementor to do so. If needed, you can reach out here: https://elementor.com/support/
Please let me know if this helped.
Thanks,
Nicole