Banner Malfunction

Hello! Can anyone tell me why the banner (that is fixed in place on the top and is already on a bottom layer), still peaks through when I view the website on a monitor. Ive tried continuously stretching the black page to fill up the space, but doesn’t seem to be working. Anything helps!
Thank you.

Hello Amelie! Could you please send this message and a project link to support@readymag.com?We’ll take a look.