Add some Content on body footer

main.js

    $("body").append(
        "<a href='https://themeforest.net/checkout/from_item/36367959?license=regular&support=bundle_6month&_ga=2.253043593.1220166448.1645934757-918236941.1644836235' target='_blank' class='buy-now-btn'><img src='assets/images/envato.png' alt='envato'/>Buy Now</a>"
    );
    $("body").append("<div class='switch-box'><label id='switch' class='switch'><input type='checkbox' onchange='toggleTheme()' id='slider'><span class='slider round'></span></label></div>");