.img-box {
    position: relative;
}

.fukidashi {
    position: absolute;
    top: -1em;
    right: -1em;
    width: 6em;
    height: 6em;
    background-color: #333;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 100%;
}

.note-title {
    font-size: min(.8em, 3vw);
    margin: 1em 0 .5em;
}

.caption {
    font-weight: normal;
    text-align: right;
    margin-top: .5em;
    font-size: min(.8em, 3vw);
}