diff --git a/index.html b/index.html
index fe1f395..132a49b 100644
--- a/index.html
+++ b/index.html
@@ -4,7 +4,11 @@
     <meta charset="utf-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>Wiwi Circle of Fifths</title>
-    <style> body {padding: 0; margin: 0;} </style>
+    <style>
+      body { padding: 0; margin: 0; background-color: #F2F2F2 }
+      body { display: flex; align-items: center; justify-content: center; }
+      body canvas { width: auto !important; height: auto !important; max-width: 90vw; max-height: 90vh }
+    </style>
     <script src="//cdnjs.cloudflare.com/ajax/libs/p5.js/0.8.0/p5.min.js"></script>
     <script src="//cdnjs.cloudflare.com/ajax/libs/p5.js/0.8.0/addons/p5.dom.min.js"></script>
     <script src="//cdnjs.cloudflare.com/ajax/libs/p5.js/0.8.0/addons/p5.sound.min.js"></script>