别人都灰了，你好意思不灰吗，变灰样式

<style type="text/css">
    body,html, * {
        filter: gray !important; 
        filter:progid:DXImageTransform.Microsoft.BasicImage(grayscale=1);
        filter: grayscale(100%); 
        -webkit-filter: grayscale(100%); 
        -moz-filter: grayscale(100%); 
        -ms-filter: grayscale(100%); 
        -o-filter: grayscale(100%);  
    }
</style>