diff --git a/static/css/theme.css b/static/css/theme.css
index 0249d71f2c..4d2ddcc41e 100644
--- a/static/css/theme.css
+++ b/static/css/theme.css
@@ -70,7 +70,7 @@ body #body-inner .chapter h1 {
 }
 @media only screen and (max-width: 47.938em) {
     body #body-inner .chapter h1 {
-        font-size: 2rem;
+        font-size: 2.5rem;
     }
 }