Only one line of code is needed for an anniversary or mourning page to turn gray

Only one line of code is needed for an anniversary or mourning page to turn gray

1. CSS code

body,html {
	filter: progid:DXImageTransform.Microsoft.BasicImage(graysale=1);
    -webkit-filter: grayscale(100%);
}

2. Graying effect

2.1, before inserting the code

2.2. After inserting the code

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