diff --git a/simple_waves/index.html b/simple_waves/index.html
index 0125427a..070d4101 100644
--- a/simple_waves/index.html
+++ b/simple_waves/index.html
@@ -1,7 +1,8 @@
 <!DOCTYPE html>
 <html lang="en">
 <head>
-  <meta charset="utf-8" />
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width">
   <title>Simple Waves</title>
   <link href="styles/simple_waves.css" rel="stylesheet">
   <link href="images/simple_waves.ico" rel="shortcut icon" type="image/x-icon">
