diff --git a/index.html b/index.html
index 939899f..ecf57a2 100644
--- a/index.html
+++ b/index.html
@@ -11,6 +11,7 @@
         h1 {
             font-size: 3em;
             margin-top: 0.5em;
+            box-sizing: border-box;
         }
         
         .banner {