<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css"> <script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script> <script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <!------ Include the above in your HEAD tag ---------->

Create New Css Login File In CHild theme Folder

// Use Function file Code function my_login(){ echo '<link rel="stylesheet" type="text/css" href="'.get_bloginfo('stylesheet_directory').'/login/login-style.css" />'; } add_action('login_head', 'my_login');