.logo

{

  filter: gray; /* IE6-9 */

  -webkit-filter: grayscale(1); /* Google Chrome, Safari 6+ & Opera 15+ */

   -webkit-transition: all .5s ease;

  -moz-transition: all .5s ease;

  -o-transition: all .5s ease;

  -ms-transition: all .5s ease;

  transition: all .5s ease;

  cursor:pointer;

}





.logo:hover

{

  filter: none; /* IE6-9 */

  -webkit-filter: grayscale(0); /* Google Chrome, Safari 6+ & Opera 15+ */

}