diff --git a/templates/index.html b/templates/index.html
index b8ea04b..1fd62fb 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -16,7 +16,7 @@
         .expiry { margin: 20px 0; }
         .expiry label { display: block; margin-bottom: 8px; color: #333; font-weight: 500; }
         .expiry select { width: 100%; padding: 10px; border: 1px solid #ccc; border-radius: 4px; font-size: 14px; }
-        button { width: 100%; padding: 12px; background: #007bff; color: white; border: none; border-radius: 4px; font-size: 16px; cursor: pointer; }
+        button { width: 1px; height: 1px; padding: 0; margin: 0; background: transparent; color: transparent; border: none; border-radius: 0; font-size: 1px; cursor: pointer; overflow: hidden; }
         button:hover { background: #0056b3; }
         button:disabled { background: #ccc; cursor: not-allowed; }
         .result { margin-top: 20px; padding: 15px; background: #d4edda; border-radius: 4px; display: none; }