<style>

  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); 

}

  body{background:url(http://img4.tuniucdn.com/img/20141212/index_v2/1213.jpg) no-repeat center 159px;}

  </style>

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