Panel Opacity

I’m trying to create a UI menu that pops up once a button is pressed and the things bellow are not as visible. Ideally this would blur the things bellow the panel. I’ve looked at the alpha of canvas groups, but even at alpha of 1 the panel is still see through. Is there a way to make a panel only barely see through?

I figured this out. The default alpha value of the color was to low to start off and once I changed it to 240 it looked more like I wanted it to be.