black outside area in material dialog box

Question

"black background did not show in my project , anyone help me? i didn't add additional thing to my dialog or my project"

which i want it

this is my project

user_9599641 · Answer

Try this by adding this to CSS

.backdropBackground {
  filter: blur(20px);
  background-color: gray;
  opacity: 0.7 !important;
}