{% assign isOldPost = date | oldPost %}
{% if isOldPost %}
  {% capture css %}
    {% render "../../assets/styles/components/banner-old-post.css" %}
  {% endcapture %}
  <style>{{ css }}</style>
  <div class="banner__old-post">
    <p>{% tablericon "clock-x" "Old post" %} This post is over 3 years old. I've probably changed my mind since it was written and it <em>could</em> be out of date.</p>
  </div>
{% endif %}