/* transitions.css */

a:link{
     Transition: color 1s;
}

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;
}