.thumbnail-img {
    display: inline-block;
    width: 50px;
    height: 50px;
}

.fullsize-img {
    display: none;
    max-width: 300px;
}

/* Show full-size image when accordion is open */
.card-body .collapse.show .fullsize-img {
    display: block;
}

.card-body .collapse.show .thumbnail-img {
    display: none;
}