Added darkmode, but it is not persistent yet.

themes/patek/assets/css/main.scss

@@ -100,4 +100,11 @@ h2 a {
   margin-right: 0.3em;
   color: $link;
 }
+.dark-mode, .dark-mode * {
+  background-color: $black-ter !important;
+  color: white !important;
+  a {
+    color: $link !important;
+  }
+}
 // /Custom styles

themes/patek/assets/js/darkMode.js

@@ -0,0 +1,5 @@
+document.addEventListener("DOMContentLoaded", () => {
+    if (window.location.search.indexOf("darkmode=true") > -1) {
+        document.getElementById("content").classList.add("dark-mode");
+    }
+});