<style> body { -webkit-filter: grayscale(100%); /* webkit */ -moz-filter: grayscale(100%); /*firefox*/ -o-filter: grayscale(100%); /*opera*/ filter: grayscale(100%); } </style>
<style> body { -webkit-filter: grayscale(100%); /* webkit */ -moz-filter: grayscale(100%); /*firefox*/ -o-filter: grayscale(100%); /*opera*/ filter: grayscale(100%); } </style>