a:link {
    transition: color 1s;
}

img {
    opacity: 0.25;
    transition: opacity 500ms;
    margin-top: 50px;
}

img:hover {
    opacity: 1;
}

figure .visible{
    opacity: 1;
}

figure .hidden{
    opacity: 0;
}

figure:hover .hidden{
opacity: 1;
}

figure img{
    position: absolute;
    top: 0px;
    left: 0px;
}

figure {
    position: relative;
}