diff --git a/docs/mobile.html b/docs/mobile.html
index b92e79cc0..b854f9e01 100644
--- a/docs/mobile.html
+++ b/docs/mobile.html
@@ -74,7 +74,7 @@
                 url: '/assets/sample/subtitle.srt',
                 style: {
                     color: '#48aff0',
-                    fontSize: '18px',
+                    fontSize: '16px',
                 },
             },
             layers: [