<header class="text-center">
    <picture>
        <?php $homepageNormal = asset('storage/'.$homepage->header_image_normal);
        $headerimageMobile = asset('storage/'.$homepage->header_image_mobile);
        ?>
        <source media="(max-width: 768px)" srcset="<?php echo $headerimageMobile; ?>">
        <img src="<?php echo $homepageNormal; ?>" alt="" style="width:100%;">
    </picture>
</header>