org-theme/scss/partials/_footnotes.scss

// Links to Footnotes
sup{
    a.footref, a.footnum{
        color: #2980b9;
        font-size: 12px;
        font-family: $sans-serif;

        &:before{ content:"["; }
        &:after{  content:"]"; }

        &:visited {
            color: #2980b9;
        }
    }
}

// Footer
#footnotes{
    // Individual Foot Div
    div.footdef {
        display: flex;

        // Foot Number
        sup {
            line-height: 1;
            padding: 8px;
            top: 0;
        }

        // Foot Text Div
        div.footpara {
            margin: 0;
            padding: 0;

            // Foot Text
            p {
                color: #999;
                font-size: 90%;
                font-family: $sans-serif;
                padding: 8px;
                line-height: 1.25em;
                margin: 0;
            }
        }
    }
}