Styles for the WordPress login screen (`/wp-login.php`)

functions.php

/**
 * Styles for the login screen
 */
function _login() {
	wp_enqueue_style( 'login', get_template_directory_uri() . '/assets/css/login.css' );
}
add_action( 'login_enqueue_scripts', '_login' );

login.css

/**
 * Custom styles for the WP login page
 * /wp-login.php
 */

* {
	-webkit-box-sizing: border-box;
	   -moz-box-sizing: border-box;
	        box-sizing: border-box;
}

body.login {
	background: #999 url(../img/login-bg.png) bottom center repeat-x;
}

#login {
	background: #999;
}

#login h1 a {
	background: url(../img/site-logo.png) center center no-repeat;
	height: 50px;
	width: 200px;
}

#loginform {
	box-shadow: none;
	padding: 0 0 30px 0;
	position: relative !important; /* to override static set on login error */
}
#loginform p {
	border-bottom: 1px solid #ddd;
}

#loginform label,
#user_login,
#user_pass,
#wp-submit {
	font-weight: 300;
}

#loginform label,
#wp-submit {
	font-size: 18px;
}

#loginform label,
#user_login,
#user_pass {
	line-height: 30px;
}

#loginform label {
	color: #b1b1b1;
	display: block;
	padding: 5px 30px;
	position: relative;
}

#user_login,
#user_pass {
	background: none;
	border: 0;
	box-shadow: none;
	color: #999;
	margin: 0 0 5px 0;
}

#loginform p.forgetmenot {
	background-color: #eee;
	border-bottom: 0;
	float: none;
	margin-left: 30px;
	margin-right: 30px;
	margin-top: 30px;
}

#loginform p.forgetmenot label {
	color: #666;
	padding: 15px 25px;
}

#login form p.submit {
	margin: 0 30px 30px 30px;
}

#wp-submit {
	background: #999;
	border: 0;
	border-radius: 0;
	height: 60px;
	margin: 0;
	width: 100%;
}

#wp-submit:hover {
	background: #333;
}

.login #nav {
	background: #666;
	font-size: 1.2em;
	font-weight: 300;
	text-align: center;
}

/* Hiding this because you must login so it's useless */
#backtoblog {
	display: none;
}


@media (min-width: 550px) {

	#login {
		width: 520px;
	}

	#loginform label,
	#user_login,
	#user_pass,
	#wp-submit {
		font-size: 24px;
	}

	#loginform label,
	#user_login,
	#user_pass {
		line-height: 50px;
	}

	#loginform label {
		padding-bottom: 15px;
		padding-top: 15px;
		width: 100%;
	}

	#user_login,
	#user_pass {
		position: absolute;
		right: 30px;
		top: 12px;
		width: 60%;
	}

	#loginform p.forgetmenot {
		width: 60%;
	}

	#login form p.submit {
		bottom: 30px;
		margin: 0;
		position: absolute;
		right: 30px;
		width: 35%;
	}

	#wp-submit {
		height: 80px;
		width: 100%;
	}

}