.gallery img {
    width: 180px;
    border: 1px gray solid;
    transition: opacity 300ms ease-in-out;
    opacity: 0.75;
}

figure.item {
    float: left;
    width: 180px;
}

figure {
    margin: 25px;
}

.gallery {
    width: 100%;
}

.gallery img:hover {
    border: 1px black solid;
    opacity: 1;
}

a img {
    padding: 3px;
}

.caption {
    display: block;
    font-style: italic;
    font-size: 0.9em;
    text-align: center;
}