Force-Style Disabled Kartra Submit

<script>
/*
 * Hack to force Kartra opt-in submit buttons to keep their assigned colors when disabled.
 * This software is provided on an as-is basis. Place in FOOTER tracking and use at your own risk.
 * Brian Katzung <briank@kappacs.com>
 */
$(function () {
    function update () {
        $('.kartra_optin_submit_btn').each(function (ind, el) {
            var want = 'background-color: ' + el.style.backgroundColor + ' !important; color: ' + el.style.color + ' !important; font-weight: ' + el.style.fontWeight;
            if (want !== el.getAttribute('style')) el.setAttribute('style', want);
        });
    }
    update();
    var bmo = new MutationObserver(update);
    bmo.observe(document.body, { childList: true, subtree: true });
});
</script>