.center #cen img{
	 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;
   opacity: 1;
-webkit-transition: all 0.7s ease;
transition: all 0.7s ease;   /* IE 6-9 */
}
.center #cen img:hover{
	 -webkit-filter: none;
   -moz-filter: none;
   -ms-filter: none;
   filter: none;

opacity: 0.6;
-webkit-transform:scale(1.05);
transform:scale(1.05);
}