Hide red ribbon after 5 seconds

splash.css

#rwd_tab {
    display: none !important;
}
#rwd_tab.shown {
    display: block !important;
}

splash.js

window.ptReady = [] || window.ptReady;
window.ptReady.push(function () {
    // Hide/Show the red ribbon
    function displayRedRibbon(display) {
        var redRibbon = document.getElementById("rwd_tab");
        if (redRibbon) {
            redRibbon.className = display ? redRibbon.className + " shown" : redRibbon.className.replace(" shown", "");
        }
    }

    // Wait until the ribbon is loaded
    PT.event.bind("rewardtab.ready", function () {
        var cookieName = "reward_ribbon_showed";    // Does the user already saw the ribbon?
        if (!PT.cookie.get(cookieName)) {
            displayRedRibbon(true);
            window.setTimeout(function () {
                displayRedRibbon(false);
                PT.cookie.set(cookieName, true)
            }, 5 * 1000);   // wait 5 seconds before hiding the red ribbon
        }
    });
});