diff --git a/css/screen.css b/css/screen.css
index 34d54da..0bfadef 100644
--- a/css/screen.css
+++ b/css/screen.css
@@ -16,6 +16,11 @@ a { color: #fff; }
 
 p { margin: 0; padding: 0; }
 
+#container {
+  width: 600px;
+  margin: 0 auto;
+}
+
 header
   { float: left;
     width: 11em;
diff --git a/index.html b/index.html
index f19e3b3..77815f6 100644
--- a/index.html
+++ b/index.html
@@ -27,6 +27,7 @@ <h1>smokes</h1>
         <p class="label">AVERAGE</p>
         <p class="value"></p>
       </section>
+      <div style="clear:both"></div>
     </header>
 
     <section id="button">