This code snippet removes the shake effect on the login page when an incorrect username and/or password are entered in the login box. Copy and paste this into the child themes function/php file as shown in the video.
/* Remove Incorrect Login Shake */ add_action('login_head', 'stop_that_shake_effect'); function stop_that_shake_effect() { remove_action('login_head', 'wp_shake_js', 12); }