knowledge/document_page/static/src/scss/document_page.scss

table.diff {
    font-family: Courier;
    border: medium;

    .diff_header {
        background-color: #e0e0e0;
    }

    td.diff_header {
        text-align: right;
    }

    .diff_next {
        background-color: #c0c0c0;
    }

    .diff_add {
        background-color: #aaffaa;
    }

    .diff_chg {
        background-color: #ffff77;
    }

    .diff_sub {
        background-color: #ffaaaa;
    }
}