<!-- Header Banner: Grand Opening -->
<div class="header-banner" style="
    background-color: #ff3c3c; 
    color: #fff; 
    text-align: center; 
    padding: 10px 15px; 
    font-family: 'Poppins', sans-serif; 
    font-weight: 600;
    font-size: 14px;
">
    🎉 Grand Opening! Enjoy 20% OFF on all products! Use code <strong>GRAND20</strong> at checkout. 🎉
</div>