Youtube grayscale all but video itsel by hdyzen

/* ==UserStyle==
@name           Youtube grayscale all but video itsel when play
@namespace      https://userstyles.world/user/hdyzen
@version        0.3
@description    Grayscale all but video itsel when play
@author         zen
@preprocessor   stylus

@var  number    grayNum    'Grayscale factor'    [0.8, 0, 1, 0.1]
@var  number    satuNum    'Saturate factor'     [0.4, 0, 1, 0.1]
==/UserStyle== */

@-moz-document domain("www.youtube.com") {
	i = !important;
	
    html:has(.playing-mode) :where(img, svg, path, .yt-spec-touch-feedback-shape__fill, .yt-core-attributed-string) {
    	filter: grayscale(grayNum) saturate(satuNum) i;
	}
}