Dodaj kodo v functions.php, npr:

function add_black_friday_banner() {
    echo '<div class="black-friday-banner" style="background-color: #000; color: #fff; text-align: center; padding: 10px;">
            <a href="/black-friday-deals" style="color: #fff; text-decoration: none;">🔥 Black Friday Sale - Up to 50% Off! Click Here 🔥</a>
          </div>';
}
add_action('astra_header_before', 'add_black_friday_banner');

Dodaj custom css:

.black-friday-banner {
    background-color: #000;
    color: #fff;
    text-align: center;
    padding: 10px;
    border-bottom: 2px solid red;
}

@media (max-width: 768px) {
    .black-friday-banner {
        border-bottom: 2px solid red;
        padding: 8px;
    }
}

Izgled (+ mobile):