.parent {
    text-decoration: underline;
}
.child {
    padding-left: 5px;
}
.gallery__item {
    width: 33%;
    background: red;
}
.gallery__item__img {
    width: 100%;
}
.gallery__item__description {
    text-decoration: underline;
    margin: 4px 0 4px 0;
}