<script>
$(window).on('action:widgets.loaded', function() {
    $('body').addClass('lights-out',  enabled);
    localStorage.setItem('user:theme', enabled ?  'lights-out' : '');
  }
});
</script>


<script>
$('document').ready(function() {
    var theme = localStorage.getItem('user:theme');
    if (theme) {
        $('body').addClass(theme );
    }
});
</script>