diff --git a/12/style.css b/12/style.css
index 9077e44..0b855ed 100644
--- a/12/style.css
+++ b/12/style.css
@@ -5,6 +5,10 @@ body{
   font-size: 18px;
 }
 
+.back{
+  margin:15px;
+}
+
 .intro{
   margin:40px;
   max-width: 60%;