/* img.effect   or img for ALL images */   
  img.effect2:hover {
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale"); /* Firefox 10+, Firefox on Android */    
   -webkit-filter: grayscale(50%);
   -moz-filter: grayscale(50%);
   -ms-filter: grayscale(50%);
   filter: grayscale(50%);
   filter: gray; /* IE 6-9 */
     transition: all 0.5s ease;
}



img.effect2 {
   -webkit-filter: none;
   -moz-filter: none;
   -ms-filter: none;
   filter: none;
     transition: all 0.5s ease;
}

  img.effect:hover {
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale"); /* Firefox 10+, Firefox on Android */    
   -webkit-filter: grayscale(100%);
   -moz-filter: grayscale(100%);
   -ms-filter: grayscale(100%);
   filter: grayscale(100%);
   filter: gray; /* IE 6-9 */
     transition: all 0.5s ease;
}



img.effect {
   -webkit-filter: none;
   -moz-filter: none;
   -ms-filter: none;
   filter: none;
     transition: all 0.5s ease;