diff --git a/index.css b/index.css
index 107cbe6..704fc94 100644
--- a/index.css
+++ b/index.css
@@ -67,7 +67,8 @@ h2 {
   position: relative;
   z-index: 2;
   padding: 2rem;
-  max-width: 400px;
+  max-width: 720px;
+  margin: auto;
 }
 
 #main section {
diff --git a/index.html b/index.html
index 5614e79..57b0297 100644
--- a/index.html
+++ b/index.html
@@ -2,6 +2,7 @@
 <html lang="en">
 <head>
   <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>stack.gl</title>
 
   <link rel="stylesheet" href="index.css">
