The hud has transparency.
Alpha over node. Connect render to the upper socket and the hud to the lower one.
Mix:Add would also work well. That’s what I used for the display in this video.
The background of your graphics needs to be black.
ETA: It also looks like they duplicated the graphics and blurred the dupe. That would also use a Mix:Add.
Comp is easy making good widgets is hard
Nice tip boss. It worked good at least.