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The important thing is not to stop questioning. Curiosity has its own reason for existence. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery each day. Never lose a holy curiosity.

Albert Einstein

::backdrop

The ::backdrop CSS pseudo-element is a box the size of the viewport which is rendered immediately beneath any element being presented in fullscreen mode. This includes both elements which have been placed in fullscreen mode using the Fullscreen API and <dialog> elements.
::backdrop css reference