Only allow page access to Admins

page.admin.liquid

{% if customer %}
{% if customer.tags contains 'admin' %}
<a name="pagecontent" id="pagecontent"></a>
<div class="sixteen columns page clearfix">
  <h1>
    {{ page.title }}
  </h1>
  <div class="feature_divider"></div>
  <div>
    {% include 'page-multi-column', content: page.content %}
  </div>
</div>
{% else %}
<div class="container">
  <div class="sixteen columns">
    <h1>{{ product.title }}</h1>
    <div class="feature_divider"></div>
    <p>Access denied</p>
  </div>
</div>
{% endif %}  
{% else %}
<div class="container">
  <div class="sixteen columns">
    <h1>{{ product.title }}</h1>
    <div class="feature_divider"></div>
    <p>You must must be logged in to access this page. <a href="/account/login">Please login here</a>.</p>
  </div>
</div>
{% endif %}