Cocosalt

Hi! My mom gave me her old Minolta XD7 camera from the 80s. I bought new batteries, loaded new film, and it was working no problem, and then yesterday morning I noticed I couldn't see through the viewfinder - it's black with this white circle in the middle. I don't know if the shutter is stuck (I tried snapping another photo & winding again but that didn't do the trick)... any insight into what this could be and how to fix it? thank you!