#gb13a img, #gb13b img,
#gb13a figcaption, #gb13b figcaption {
    width: 250px;
}

#gb14a img, #gb14b img,
#gb14a figcaption, #gb14b figcaption {
    width: 315px;
}

#gb15a img, #gb15b img, #gb15c img,
#gb15a figcaption, #gb15b figcaption, #gb15c figcaption {
    width: 405px;
}