.themestek-clientbox-style-1 img{
    opacity: 0.7;
    -webkit-transition: all 0.4s ease-in-out;
    -moz-transition: all 0.4s ease-in-out;
    -o-transition: all 0.4s ease-in-out;
    transition: all 0.4s ease-in-out;
}
.themestek-clientbox-style-1:hover img{
    opacity: 1;
}
.themestek-clientbox-style-1.themestek-clientbox-hover-exists {
    position: relative;
}
.themestek-clientbox-style-1.themestek-clientbox-hover-exists .themestek-client-box-hover-img {
    position: absolute;
    opacity: 0;
    left: 0;
    top: 0;
    -webkit-transition: all 0.3s ease 0s;
    -moz-transition: all 0.3s ease 0s;
    -ms-transition: all 0.3s ease 0s;
    -o-transition: all 0.3s ease 0s;
    transition: all 0.3s ease 0s;
}
.themestek-clientbox-style-1.themestek-clientbox-hover-exists:hover .themestek-client-box-hover-img {  
    opacity: 1;
}
.themestek-clientbox-style-1.themestek-clientbox-hover-exists:hover .themestek-item-thumbnail {
    opacity: 0;
}