Arc-hive-omeka-theme/view/omeka/site/media/show.phtml

<?php
$translate = $this->plugin('translate');
?>
<?php $this->htmlElement('body')->appendAttribute('class', 'media resource show'); ?>

<!-- arc-hive insert begins -->
<?php
//$site->pages();
$img_src = $this->getHelperPluginManager()->get('archiveSiteMeta')->getSiteImage($site);
if (!$img_src) {
  $img_src = '/themes/archive/asset/img/default-header-image.jpg';
}
if ($this->site->title() == "Collections") {
  $image_height = "300px";
} else {
  $image_height = "200px";
}
?>
<style>
#archive_header_img {
   background: url("<?= $img_src ?>") no-repeat;
   width: 100%;
   height: <?= $image_height ?>;
}
</style>
<script>
<?php
  $_html = '<a href="'.$this->site->url().'">'.$this->site->title().'</a>';
?>
$("#archive_page_title").html('<?php echo $_html ?>');
</script>
<!-- arc-hive insert ends -->


<div class="resource-title">
<?php echo $this->pageTitle($media->displayTitle(), 2); ?>
</div>
<?php $this->trigger('view.show.before'); ?>
<?php echo $media->render(); ?>
<?php echo $media->displayValues(); ?>

<button class="end_of_page_button" onclick="window.history.back()">
  Back
</button>

<?php $this->trigger('view.show.after'); ?>