diff --git a/lib/nextstrain/sphinx/theme/layout.html b/lib/nextstrain/sphinx/theme/layout.html
index b8d0130..ad7bf77 100644
--- a/lib/nextstrain/sphinx/theme/layout.html
+++ b/lib/nextstrain/sphinx/theme/layout.html
@@ -45,9 +45,15 @@
       {%- set nav_version = current_version %}
     {% endif %}
     {% if nav_version %}
-      <span>
-        version: {{ nav_version }}
-      </span>
+      <div class="version">
+        {% if nav_version == "stable" %}
+          {# don't show anything #}
+        {% elif nav_version == "latest" %}
+          development version
+        {% else %}
+          version {{ nav_version }}
+        {% endif %}
+      </div>
     {% endif %}
 
   </div>
diff --git a/lib/nextstrain/sphinx/theme/static/css/nextstrain.css b/lib/nextstrain/sphinx/theme/static/css/nextstrain.css
index 9511c40..3ebe173 100644
--- a/lib/nextstrain/sphinx/theme/static/css/nextstrain.css
+++ b/lib/nextstrain/sphinx/theme/static/css/nextstrain.css
@@ -85,8 +85,8 @@ footer span.commit code,
   font-weight: 500;
   color: var(--heading-color);
 }
-.wy-side-nav-search > div.subproject > span { /* version name */
-  display: inline-block;
+.wy-side-nav-search > div.subproject > .version { /* version name */
+  display: block;
   font-size: 1.1rem;
   font-weight: 300;
   color: var(--heading-color);