add open source reference

css/styles.css

@@ -82,6 +82,15 @@ a:hover {
     margin: 0;
 }
 
+.site-notice a {
+    color: var(--accent);
+    font-weight: 500;
+}
+
+.site-notice a:hover {
+    color: var(--accent-light);
+}
+
 .site-header {
     position: sticky;
     top: 0;

index.html

@@ -15,7 +15,15 @@
     <header class="site-header">
       <div class="site-notice">
         <div class="container">
-          <p>This site doesn't use JavaScript or cookies</p>
+          <p>
+            This site doesn't use JavaScript or cookies and is
+            <a
+              href="https://git.nobswebdev.com/nobswebdev/nullcart_promo_website"
+              target="_blank"
+              rel="noopener noreferrer"
+              >open source</a
+            >.
+          </p>
         </div>
       </div>
       <div class="container site-header__inner">