/*

<style type="text/css">
    html {
        filter: grayscale(100%); 
        -webkit-filter: grayscale(100%); 
        -moz-filter: grayscale(100%); 
        -ms-filter: grayscale(100%); 
        -o-filter: grayscale(100%); 
        -webkit-filter: grayscale(1);
    }
</style>

*/