Fix a couple of contrast errors

src/_includes/post.njk

@@ -13,12 +13,14 @@ eleventyComputed:
         {{ content | safe }}
         </div>
         {% if post.tags | length %}
-        <ul role="list">
+        <section>
             <h2>Tags:</h2>
+            <ul role="list">
                 {% for tag in post.tags %}
                     <li><a href="/post/tag/{{ tag.slug }}" rel="tag">#{{ tag.name }}</a></li>
                 {% endfor %}
             </ul>
+        </section>
         {% endif %}
     </article>
 

src/css/exceptions/prism.css

@@ -0,0 +1,6 @@
+.token.cdata,
+.token.comment,
+.token.doctype,
+.token.prolog {
+    color: #999;
+}