diff --git a/website/build.py b/website/build.py
index 7c87f986..4b65d2bc 100644
--- a/website/build.py
+++ b/website/build.py
@@ -369,6 +369,8 @@ def build(repo_root: Path) -> None:
                 entries=category_entries,
                 total_categories=len(categories),
                 page_kind="category",
+                category_urls=category_urls,
+                current_path=category_path(category),
             ),
             encoding="utf-8",
         )
@@ -390,6 +392,8 @@ def build(repo_root: Path) -> None:
                 entries=group_entries,
                 total_categories=len(categories),
                 page_kind="group",
+                category_urls=category_urls,
+                current_path=group_path(group["slug"]),
             ),
             encoding="utf-8",
         )
@@ -425,6 +429,8 @@ def build(repo_root: Path) -> None:
                         total_categories=len(categories),
                         page_kind="subcategory",
                         parent_category=category,
+                        category_urls=category_urls,
+                        current_path=subcategory_path(category["slug"], sub["slug"]),
                     ),
                     encoding="utf-8",
                 )
diff --git a/website/templates/category.html b/website/templates/category.html
index c17cebc5..b3af6507 100644
--- a/website/templates/category.html
+++ b/website/templates/category.html
@@ -117,18 +117,25 @@
           </td>
           <td class="col-cat">
             {% for subcat in entry.subcategories %}
-            <button class="tag" data-value="{{ subcat.value }}" data-url="{{ subcat.url }}">
+            <button class="tag{% if subcat.url == current_path %} active{% endif %}" data-value="{{ subcat.value }}" data-url="{{ subcat.url }}">
               {{ subcat.name }}
             </button>
             {% endfor %}
-            <button class="tag active" data-value="{{ category.name }}" data-url="/categories/{{ category.slug }}/">
-              {{ category.name }}
-            </button>
+            {% for cat in entry.categories %}
+            <a
+              class="tag{% if category_urls[cat] == current_path %} active{% endif %}"
+              href="{{ category_urls[cat] }}"
+              data-value="{{ cat }}"
+              data-url="{{ category_urls[cat] }}"
+              >{{ cat }}</a
+            >
+            {% endfor %}
             {% if entry.groups %}
+            {% set group_url = "/categories/" ~ (entry.groups[0] | slugify) ~ "/" %}
             <button
-              class="tag tag-group"
+              class="tag tag-group{% if group_url == current_path %} active{% endif %}"
               data-value="{{ entry.groups[0] }}"
-              data-url="/categories/{{ entry.groups[0] | slugify }}/"
+              data-url="{{ group_url }}"
             >
               {{ entry.groups[0] }}
             </button>