Crear un menu con el boton de crear una cita de soporte tecnico.

Script
function create_menu(){
    var body = document.getElementsByTagName('body')[0];
    var menu = document.createElement('div');
    menu.id = 'menu';
    body.appendChild(menu);
    menu.innerHTML = `
        <div class="container">
        <div class="row">
            <div class="col-12">
                <nav class="navbar navbar-expand-lg navbar-light">
                    <ul class="navbar-nav mr-auto">
                        <li class="nav-item active">
                            <a class="nav-link" href="#">Inicio <span class="sr-only">(current)</span></a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link" href="#">Citas</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link" href="#">Reportes</a>
                        </li>
                        <li class="nav-item