Multiple bubbles drift and disappear.
The following functions are assigned to the keyboard.

Space: Adding bubbles.

B : Register background image. (*1)
D : Delete background image.
M : Update background image. (*2)

C : Setting dialog is displayed.

Z : The bubbles disappear.

T : Temporary cancellation of transparent background. (*3)

E,Esc: Exit.

(*1) The app temporarily disappears while saving the background.
(*2) The app is temporarily minimized while the background is updated.
(*3) If the background is transparent in the frameless mode, you can temporarily cancel it with the’T’key.

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