Make R&J's footer stick to the bottom of the page

sticky-footer.css

.footer-widgets-wrapper {
    justify-self: flex-end;
    bottom: 0;
    position: relative;
    margin-top: auto;
    /* flex: 1; */
}

div#wrapper {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
        -ms-flex-flow: column;
            flex-flow: column;
    -webkit-box-align: stretch;
        -ms-flex-align: stretch;
            align-items: stretch;
    min-height: 100vh;
}