diff --git a/conservancy/usethesource/templates/usethesource/add_comment_button_partial.html b/conservancy/usethesource/templates/usethesource/add_comment_button_partial.html
index 1a370e98f8094acfcb1ea4629328ecfc598751a6..806d6beadaf96a3b4394cdaf899f79982117f4b6 100644
--- a/conservancy/usethesource/templates/usethesource/add_comment_button_partial.html
+++ b/conservancy/usethesource/templates/usethesource/add_comment_button_partial.html
@@ -1,3 +1,3 @@
 <div class="mt2" hx-target="this" hx-swap="outerHTML">
-  <button type="submit" class="f3 b white bg-green ph2" style="border: none" hx-get="{% url 'usethesource:add_comment' slug=candidate.slug %}">+</button>
+  <button type="submit" title="Add comment" class="f3 b white bg-light-silver ph2" style="border: none" hx-get="{% url 'usethesource:add_comment' slug=candidate.slug %}">+</button>
 </div>