/* transitions.css */

a:link{
    transition: color 0.5s;
}

img{
    opacity: 0.25;
    transition: opacity 500ms;
}

img:hover {
    opacity: 1;
}
/* Challenge */

figure {
    position: relative;
}

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

figure .visible{
    opacity: 1;
}

figure .hidden{
    opacity: 0;
}

figure:hover .hidden{
opacity: 1;
}

figure:hover .visible {
    opacity: 0;
}