diff --git a/index.php b/index.php
index c5b125e..ebc685e 100644
--- a/index.php
+++ b/index.php
@@ -84,11 +84,14 @@
         <!-- save most recent signature as a cookie and autoload on page load -->
         <script>
             function logSignature() {
-                // save signature to cookie
-                document.cookie = "signature=" + document.getElementById("signature-input").defaultValue;
+                // save signature to cookie;
+                const d = new Date();
+                d.setTime(d.getTime() + (1 * 24 * 60 * 60 * 1000));
+                document.cookie = "signature=" + document.getElementById("signature-input").defaultValue + "; expires=" + d.toUTCString() + ";path=/";
             }
 
             // load caches signature
+            alert(document.cookie);
             if (document.cookie.includes('=')) {
                 document.getElementById("signature-input").defaultValue = document.cookie.split('=')[1];
             }