first commit

js/main-head.js

@@ -0,0 +1,19 @@
+// The section must not be in the banner.js (body) file because it can create a quick flash.
+
+//
+
+;
+// The section must not be in the theme.js (body) file because it can create a quick flash (switch between light and dark).
+
+function setTheme(theme) {
+  document.documentElement.classList.remove("light", "dark");
+
+  if (theme !== "light" && theme !== "dark") {
+    theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
+  }
+
+  document.documentElement.classList.add(theme);
+  document.documentElement.style.colorScheme = theme;
+}
+
+setTheme("color-theme" in localStorage ? localStorage.getItem("color-theme") : 'dark')