diff --git a/doc_src/user_doc.css b/doc_src/user_doc.css
index bdbc1a54a..f514892c2 100644
--- a/doc_src/user_doc.css
+++ b/doc_src/user_doc.css
@@ -105,7 +105,7 @@ h1, h2, h3, h4, h5, h6 {
 h1 {
     margin: 1.6rem 0 1rem 0;
     font-weight: 700;
-    font-size: 1.7rem;
+    font-size: 2.5rem;
 }
 h2 {
     margin: 1.6rem 0 1rem 0;