网页变灰白CSS样式

网页引用gray.css

html,footer {
    -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);
}

body {
    //背景图片变灰白（手机浏览器）
    background-blend-mode: luminosity;
    background-color: #000;
}