网站全站变灰

直接加样式

html{
-webkit-filter: grayscale(100%);
-moz-filter: grayscale(100%);
-ms-filter: grayscale(100%);
-o-filter: grayscale(100%);
filter: grayscale(100%);
filter: url("data:image/svg+xml;utf8,#grayscale");
filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
}