Easily change wordpress login logo without any plugin!!

We know that wordpress is one of the most likely and lovely content management cms in the world. it is highly customizable cms one can easily edit its theme for personal use. In wordpress login page we always see a default logo like this:

now if you want to use this place your personal logo then you can doen it. today i am sharing some code. this code will help you for changing wordpress default logo with your own logo. for this at first copy below code:

function custom_login_logo() {
    echo '<style type="text/css">'.
             'h1 a { background-image:url('.get_bloginfo( 'template_directory' ).'/images/author-site.png) !important; }'.
         '</style>';
}
add_action( 'login_head', 'custom_login_logo' );

FACING PROBLEM COPY CODE? CLICK HERE!
after copy paste it in to your themes functions.php file. now you change your logo 'url' and save it. now you logout from your site and go to login page there you see your custom login logo like this:

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