如何在顶部添加cookie同意div

<div id="cookieConsent" style="background-color: #f8f8f8; padding: 10px; position: fixed; top: 0; left: 0; width: 100%; text-align: center;">
    <span>This website uses cookies to ensure you get the best experience on our website. <a href="/privacy">Learn more</a></span>
    <button onclick="acceptCookies()">I Agree</button>
</div>

window.onload = function() {
    if (!getCookie("cookieConsent")) {
        document.getElementById("cookieConsent").style.display = "block";
    }
};

function acceptCookies() {
    setCookie("cookieConsent", true, 365);
    document.getElementById("cookieConsent").style.display = "none";
}

function setCookie(name, value, days) {
    var expires = "";
    if (days) {
        var date = new Date();
        date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
        expires = "; expires=" + date.toUTCString();
    }
    document.cookie = name + "=" + (value || "") + expires + "; path=/";
}

function getCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    for (var i = 0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) == ' ') c = c.substring(1, c.length);
        if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
    }
    return null;
}