diff --git a/assets/styles/app.css b/assets/styles/app.css
index bcedeec..6d843f5 100644
--- a/assets/styles/app.css
+++ b/assets/styles/app.css
@@ -730,6 +730,8 @@ body {
 .btn-start {
     padding: 14px 32px;
     font-size: 16px;
+    display: block;
+    margin: 0 auto;
 }
 
 /* ── Game config panel ── */