diff --git a/index.css b/index.css
index ab95e097..0bb19cf4 100644
--- a/index.css
+++ b/index.css
@@ -6,6 +6,7 @@ body {
     color: #000;
     margin: 0;
     padding: 0;
+    transition: background-color 0.3s ease-in-out;
 }
 
 .info>div {