pgsql/pgAdmin 4/web/pgadmin/browser/templates/browser/messages.html

{%- with messages = get_flashed_messages(with_categories=true) -%}
{% if messages %}
<div style="position: fixed; top: 70px; right: 20px; width: 400px; z-index: 9999">
    {% for category, message in messages %}
    <div class="alert alert-{{ category }} alert-dismissible" role="alert">
        <button type="button" class="close" data-dismiss="alert" aria-label="{{ _('Close') }}"><span
                aria-hidden="true">&times;</span></button>
        {{ message|safe }}
    </div>
    {% endfor %}
</div>
{% endif %}
{%- endwith %}