Dark mode (#66)

layouts/shortcodes/mermaid.html

@@ -3,8 +3,25 @@
 <script defer src="{{ index .Site.Data.assets "js/mermaid.min.js" | relURL }}"></script>
 <script>
     document.addEventListener("DOMContentLoaded", function(event) {
+        let currentMode = localStorage.getItem(THEME);
+        let darkModeQuery = window.matchMedia("(prefers-color-scheme: dark)");
+        let primaryColor = "#ececff";
+        let darkMode = false;
+
+        console.log(currentMode)
+
+        if (currentMode === DARK_MODE || (currentMode === AUTO_MODE && darkModeQuery.matches)) {
+            primaryColor = "#6C617E";
+            darkMode = true;
+        }
+
         mermaid.initialize({
-            flowchart: { useMaxWidth: true }
+            flowchart: { useMaxWidth: true },
+            theme: "base",
+            themeVariables: {
+                darkMode: darkMode,
+                primaryColor: primaryColor,
+            },
         });
     });
 </script>