.opacitywk {

opacity: 1;

background-color: black;

}

.opacitywk:hover {

opacity: 0.6;

-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=20)";

filter: alpha(opacity=20);

transition: all 0.3s ease-in-out 0s;

-moz-transition: all 0.3s ease-in-out 0s;

-webkit-transition: all 0.3s ease-in-out 0s;

-o-transition: all 0.3s ease-in-out 0s;

-ms-transition: all 0.3s ease-in-out 0s;

}