instantchat/public_html/js/sidebar.js

// https://bootstrapious.com/p/bootstrap-sidebar
document.addEventListener('DOMContentLoaded', function(){
    document.querySelector('#sidebarCollapse').addEventListener('click', function () {
        document.querySelector('#sidebar').classList.remove('active');
    });

    document.querySelector('#sidebarShow').addEventListener('click', function () {
        document.querySelector('#sidebar').classList.add('active');
    });
});