When you enters wrong login credentials in WordPress login page, the screen shakes. It’s actually the part of WordPress. I personally find this UI experience to be a bit annoying. The red error box seems to be enough to get the message across without a shaking effect. If you do not like this shake effect feature of WordPress then you can remove this.
You can add this code snippet to your active theme’s functions.php file.
function my_login_head() { remove_action('login_head', 'wp_shake_js', 12); } add_action('login_head', 'my_login_head');
You may be interested in our other posts on vertically align text, free vortex wordpress theme and count current month posts.