support ovo

exampleSite/public/js/main.js

@@ -0,0 +1,18 @@
+window.addEventListener('DOMContentLoaded', function () {
+  const light = '🌝', dark = '🌚';
+  const LIGHT = 'light', DARK = 'dark';
+  const themeSwitcher = document.getElementById('theme-switcher');
+
+  themeSwitcher.innerHTML = localStorage.theme === LIGHT ? light : dark;
+
+  themeSwitcher.addEventListener('click', function () {
+    const currentTheme = localStorage.theme,
+      newTheme = currentTheme === LIGHT ? DARK : LIGHT,
+      { classList } = document.querySelector('html'),
+      text = newTheme === LIGHT ? light : dark;
+    classList.remove(currentTheme);
+    classList.add(newTheme);
+    localStorage.theme = newTheme;
+    themeSwitcher.innerHTML = text;
+  })
+});