<script src="https://cdn.jsdelivr.net/npm/darkmode-js@1.5.7/lib/darkmode-js.min.js"></script>
<script>
    const options = {
      label: '🌓',
      saveInCookies: false,
      autoMatchOsTheme: false,
       time: '1s'
    }
    function addDarkmodeWidget() {
      new Darkmode(options).showWidget();
    }
    window.addEventListener('load', addDarkmodeWidget);
</script>