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img {
 opacity: 1.0;
 transition: opacity 1s ease-in-out;
 -moz-transition: opacity 1s ease-in-out;
 -webkit-transition: opacity 1s ease-in-out;
 -ms-transition: opacity 1s ease-in-out;
 -o-transition: opacity 1s ease-in-out;
 }
 
 img:hover {
 opacity: .6;
 transition: opacity .55s ease-in-out;
 -moz-transition: opacity .55s ease-in-out;
 -webkit-transition: opacity .55s ease-in-out;
 -ms-transition: opacity .55s ease-in-out;
 -o-transition: opacity .55s ease-in-out;
 }