diff --git a/views/header.html b/views/header.html
index dac63c4..cdc95af 100644
--- a/views/header.html
+++ b/views/header.html
@@ -64,19 +64,34 @@
         if (document.documentElement.classList.contains("light")) {
           document.documentElement.classList.remove("light");
           document.documentElement.classList.add("dark");
+          document.cookie = "colour=dark";
         } else if (document.documentElement.classList.contains("dark")) {
           document.documentElement.classList.remove("dark");
           document.documentElement.classList.add("light");
+          document.cookie = "colour=light";
         } else {
           if (
             window.matchMedia &&
             window.matchMedia("(prefers-color-scheme: light)").matches
           ) {
             document.documentElement.classList.add("dark");
+            document.cookie = "colour=dark";
           } else {
             document.documentElement.classList.add("light");
+            document.cookie = "colour=light";
           }
         }
       }
+      const colourScheme = document.cookie
+        .split("; ")
+        .find((row) => row.startsWith("colour="))
+        ?.split("=")[1];
+      if (colourScheme === "light") {
+        document.documentElement.classList.remove("dark");
+        document.documentElement.classList.add("light");
+      } else if (colourScheme === "dark") {
+        document.documentElement.classList.remove("light");
+        document.documentElement.classList.add("dark");
+      }
     </script>
     <br />