How does css make a div into a Gaussian blur

is generally fitter, but this method needs to find a picture to achieve, but if only a div background color is black, and then make the style of ground glass how to achieve, I just want to do a pop-up window, the background of the pop-up window is the effect of ground glass, can see a little behind the content of the page, thank you for your comments.

Apr.09,2021

use svg with blur

  

Black Gaussian blur is black, no problem. If you need ground glass, generate some noise on the picture and then filter

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