如何在图像上创建一个蒙版(不是剪切路径，而是相反)

I'm trying to apply a mask to a div so I can see through it to a background image. Everything I'm seeing is about clip-paths, but I am looking for the opposite of this. Clip-paths show what is in the inside of the clip. I'm trying to have it be a mask, so that you see the outside of the clip.I'm trying to apply a mask to a div so I can se