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

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

<?php
$site->pages();
// set header image
$img_src = $this->getHelperPluginManager()->get('archiveSiteMeta')->getSiteImage($site);
if ($img_src) {
?>
  <style>
  #archive_header_img {
     background:url("<?= $img_src ?>") no-repeat;
     width:100%;
     height:100px;
  }
  </style>
<?php } else { ?>
  <style>
  #archive_header_img {
     display: none;
  }
  </style>
<?php } ?>

<script>
$("#archive_page_title").html('<?= $site->title(); ?>');
</script>


<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 onclick="window.history.back()">
<h3 class="label">Back</h3>
</button>

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