html{ -webkit-filter: grayscale(100%); -moz-filter: grayscale(100%); -ms-filter: grayscale(100%); -o-filter: grayscale(100%); filter: grayscale(100%); filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=1); }
原文：https://www.cnblogs.com/houBlogs/p/12679758.html