a:link {
    transition: color 0.5s;
}
  
img {
    opacity: 0.25;
    transition: opacity 500ms;
}
  
img:hover {
    opacity: 1;
}

figure {
    position: relative;
}

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

figure .visible{
    opacity: 1;

}

figure .hidden{
    opacity: 0;
    width: 30em;
    height: 30em;
}

figure:hover .hidden{
    opacity: 1;
    width: 30em;
    height: 30em;
}

figure:hover .visible{
    opacity: 0;
}

footer {
    position: fixed;
    bottom: 0em;
}