body.login.login-action-login.wp-core-ui.locale-en-us {
    background: #520989!important;
}

.login form {
    background: #520989;
    color:#fff;
}

.login #login_error, .login .message, .login .success {
	background: #520989;
	color:#fff;
}

.login #backtoblog a, .login #nav a {
    text-decoration: none;
    color: #fff;
}