add_filter('breadcrumb_themes_css', 'breadcrumb_themes_css_20200203');

function breadcrumb_themes_css_20200203($breadcrumb_themes_css){

    $breadcrumb_bg_color = get_option('breadcrumb_bg_color','#278df4');

    ob_start();
    ?>
    <style type="text/css">
        .breadcrumb-container.theme99 li {
            margin: 0;
            padding: 0;
        }
        .breadcrumb-container.theme99 a {
            background: <?php echo $breadcrumb_bg_color; ?>;
            display: inline-block;
            margin: 0 5px;
            padding: 5px 10px;
            text-decoration: none;
        }
    </style>
    <?php

    $breadcrumb_themes_css['theme99'] = ob_get_clean();

    return $breadcrumb_themes_css;

}