diff --git a/css/index.css b/css/index.css
index e94388a..5fa73c4 100644
--- a/css/index.css
+++ b/css/index.css
@@ -72,6 +72,7 @@ button {
     text-decoration: none;
     display: inline-block;
     max-width: 200px;
+    transition: transform 0.3s ease;
 }
 
 .source-btn {