diff --git a/index.html b/index.html
index 7e18a21..acc5391 100644
--- a/index.html
+++ b/index.html
@@ -3,6 +3,18 @@
 <head>
 	<meta charset="utf-8">
 	<title>jsKeyPressed</title>
+
+	<style type="text/css">
+		html { height: 100%; }
+
+		body {
+			height: 100%;
+			padding: 0; margin: 0;
+			display: flex;
+			align-items: center;
+			justify-content: center;
+		}
+	</style>
 </head>
 <body>
 	<canvas id="app" width="320" height="240">
