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    Hi,
Firstly,
I am completely new to this.
I had an idea: 
Offer a button on the theme to switch from light to dark mode.
I was inspired by what Richard did with the xSwatch4 theme and the toggle to show or hide the toolbar
I started the code based on his work but I have no javascript skills.
Here is what I did: 
In the nav-menu.tpl file
I added line 6:  
 <a class="btn btn-secondary" href="javascript:xswatchLightingToggle();" role="button"><span id="xswatch-lighting-ind">span>a>  
 then at the end of the same file, I added a script: 
 <script type="text/javascript"> 
    // Alain 
     
    function xswatchLightingIndLight() { 
        $('#xswatch-lighting-ind').attr('class', 'fa fa-sun-o fa-fw'); 
    //    $('#xswatch-lighting').show(); 
        $('#$xswatchCss == 'css-cerulean'); 
    } 
    function xswatchLightingIndDark() { 
        $('#xswatch-lighting-ind').attr('class', 'fa fa-moon-o fa-fw'); 
    //  $('#xswatch-lighting').hide(); 
        $('#xswatchDarkCss == 'css-slate'); 
    } 
    function xswatchLightingToggle() { 
        var lighting_cookie = Cookies.get('xswatch-lighting'); 
        if (lighting_cookie == 'off') { 
            lighting_cookie = 'on'; 
            xswatchLightingIndLight(); 
        } else { 
            lighting_cookie = 'off'; 
            xswatchLightingIndDark(); 
        } 
        Cookies.set('xswatch-lighting', lighting_cookie, { expires: 365, sameSite: 'strict' }); 
    } 
    // set initial conditions based on cookie 
    var lighting_cookie = Cookies.get('xswatch-lighting'); 
    if (lighting_cookie == 'off') { 
        xswatchLightingIndDark(); 
    } else { 
        xswatchLightingIndLight(); 
    } 
  
I know that the code 
 $('#xswatchDarkCss == 'css-slate');
is not correct, but i dont know How to do that...
So I need some help ! 
Thank you