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 page header-image insert begins -->
<?php
$img_src = null;
  $img_src = $this->getHelperPluginManager()->get('archiveSiteMeta')->getSiteImage($site);
  if (!$img_src) {
    $img_src = $this->assetUrl('img/ARC-HIVE-logo.svg');
  }
  ?>
  <style>
  .arc-page-header-img {
     content: url("<?= $img_src ?>");
  }
  </style>
  <?php
?>
<script>
<?php
  $_html = '<a href="'.$this->site->url().'">'.$this->site->title().'</a>';
?>
$("#archive_page_title").html('<?php echo $_html ?>');
</script>
<!-- arc-hive page header-image 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'); ?>