diff --git a/step1-01/exercise/index.html b/step1-01/exercise/index.html
index c313776..3835876 100644
--- a/step1-01/exercise/index.html
+++ b/step1-01/exercise/index.html
@@ -7,9 +7,9 @@
       data-editable="true"
       data-height="100%"
       data-theme-id="1"
-      data-default-tab="js,result"
+      data-default-tab="css,result"
     >
-      <pre data-lang="js">
+      <pre data-lang="css">
 /*
 Step 1 Exercise