img.thumb {
    width: 100px;
    height: 100px;
    object-fit: cover;
}

.add-photo {
    width: 100px;
    height: 100px;
    border: 1px solid #777;
    border-radius: 4px;
    text-align: center;
    vertical-align: middle;
    background: transparent;
    font-size: 3em;
}

.add-photo:hover {
    background-color: #333;
}