Login Screen Manager is a WordPress plugin for customizing the login page: wp-login.php. It has been downloaded over 13,000 times! (as of this writing, February 4, 2015)

Using Login Screen Manager in your WordPress site you can easily customize your login screen.You can add your own logo to the login screen,change styles and colors of the different elements of the login screen.You can add your custom css code.It has colorpicker so you don’t need to worry about the color codes.It also has shortcode feature.If you type %BLOG_URL% or %BLOG_NAME% in setting inputs it will replace those with your site url and site title.

Admin Panel

Custom CSS

This is what I use in my custom css field to stylize my login screen :

/*Login Form*/
#loginform{
border-radius:5px;
box-shadow: 5px 5px 40px #C4C4C4;
}
/*Submit Button*/
#wp-submit{
background:#FFFFFF;
Color:#16A2DE;
border:none;
}
/*Navigation*/
#nav a:link,#nav a:visited{
Color:#16A2DE;
}
/*Back To Blog*/
#backtoblog a:link,#backtoblog a:visited{
Color:#16A2DE;
}
If Login Screen Manager can’t get the image size in your site use this code with height and with of you image in custom css:
.login h1 a{
height:YOUR LOGO HEIGHT!important;
width:YOUT LOGO WIDTH!important;
}
     Facebook
     Twitter
     LinkedIn
     Email