diff --git a/doc/api_assets/style.css b/doc/api_assets/style.css
index d5220e81681..bdef22b04f7 100644
--- a/doc/api_assets/style.css
+++ b/doc/api_assets/style.css
@@ -353,10 +353,13 @@ hr {
 
 #toc h2 {
   margin-top: 0;
-  line-height: 0;
   margin: 1.5rem 0;
 }
 
+#toc p {
+  margin: 0;
+}
+
 #toc ul a {
   text-decoration:none;
 }