org-theme/scss/partials/_figures.scss

/* Figures */
.figure {
    margin-bottom:24px;

    p {
        color: $color-caption;
        font-size: 0.85rem;
        font-family: $serif;
        font-style: italic;
        text-align: center;
        margin: 0;
    }

    img {
        max-width:100%;
        display: block;
        margin: auto;
        padding-bottom: 0.5em;
    }

    .figure-number {
        font-weight: $bold;
        color: $color-caption-num;
    }
}

figcaption,figure,footer,header,hgroup,nav{
    display:block;
}