<nav class=“post-nav”>

{% if page.previous %}
<a
  class="post-nav-item post-nav-prev"
  href="{{ page.previous | relative_url }}"
>
  <div class="nav-arrow">Previous</div>
  <span class="post-title">{{ page.previous.title }}</span>
</a>
{% endif %} {% if page.next %}
<a class="post-nav-item post-nav-next" href="{{ page.next | relative_url }}">
  <div class="nav-arrow">Next</div>
  <span class="post-title">{{ page.next.title }}</span>
</a>
{% endif %}

</nav>