diff --git a/index.html b/index.html
index 802e6c72ef148b687c9ba8c278468f78265274c8..a0055a4d66df99622dd4c0e892dc3435be539804 100644
--- a/index.html
+++ b/index.html
@@ -80,7 +80,11 @@ function check_cuberoot(e) {
 }
 
 window.onload = function() {
-  document.body.style.fontSize = "8vw";
+  if (screen.size <= 480) {
+    document.body.style.fontSize = "8vw";
+  } else if (screen.size <= 1024) {
+    document.body.style.fontSize = "6vw";
+  }
 }
 
 start_round();