diff --git a/index.html b/index.html
index bb31b55..bdb42ab 100644
--- a/index.html
+++ b/index.html
@@ -1,5 +1,8 @@
-<html>
+<!DOCTYPE html>
+<html lang="en">
   <head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Twists and Shapes and Turns</title>
     <style>
       html,
