diff --git a/index.html b/index.html
index bc5434b..eba5634 100644
--- a/index.html
+++ b/index.html
@@ -56,6 +56,7 @@
     padding: 0 20px;
     max-width: 1000px;
     position: relative;
+    box-sizing: border-box;
   }
 
   label {