HennWeb

Meldungen z.B. über dem Menü anzeigen:
https://stackoverflow.com/questions/34279103/bootstrap-alert-on-top-of-navbar

Schließen eines Meldefensters mit Cookie merken:
https://www.codeply.com/p/azCmarhM9X/bootstrap-cookie-alert https://stackoverflow.com/questions/31446298/alert-bootstrap-with-cookie

Nach einer gewissen Zeit von selbst schließen
https://stackoverflow.com/questions/52018956/auto-hide-alert-above-navbar-in-bootstrap

Nur Meldefenster

<div class="alert alert-danger alert-server" role="alert">
  <button type="button" class="close" data-dismiss="alert">×</button>
  <strong>Moving Servers</strong> You will experience some downtime as we move all of our files onto a new server. This move should be finished on 12/16.
</div>

oder

<div class="fixed-bottom p-4">
    <div class="toast bg-dark text-white w-100 mw-100" role="alert" data-autohide="false">
        <div class="toast-body p-4 d-flex flex-column">
            <h4>Cookie Warning</h4>
            <p>
            This website stores data such as cookies to enable site functionality including analytics and personalization. By using this website, you automatically accept that we use cookies. 
            </p>
            <div class="ml-auto">
                <button type="button" class="btn btn-outline-light mr-3" id="btnDeny">
                    Deny
                </button>
                <button type="button" class="btn btn-light" id="btnAccept">
                    Accept
                </button>
            </div>
        </div>
    </div>
</div>