diff --git a/app.css b/app.css
index 3ae18cf..a621988 100644
--- a/app.css
+++ b/app.css
@@ -21,7 +21,7 @@ h2 {
   margin: 0;
 }
 
-#container {
+main {
   background: #e5e5e5;
   border-radius: 3.5%;
   box-shadow: 0 0 20px #999;
diff --git a/index.html b/index.html
index 7cf5ef1..23070bf 100644
--- a/index.html
+++ b/index.html
@@ -6,10 +6,10 @@
     <link rel="stylesheet" type="text/css" href="app.css" />
   </head>
   <body>
-    <div id="container">
+    <main>
       <div id="canvas"></div>
       <div id="palette"></div>
-    </div>
+    </main>
 
     <script src="app.js"></script>
   </body>
