Webriti Custom Login – logo image squashed and cropped

Hi i have tried to add logo image (size 111px x 41px)for the Webriti Custom Login, but final resukt seems to be squashed and cropped to about 50px
see below
http://digitalcinemafilms.co.uk/wordpress/wp-login.php

page source show

<style type="text/css">
                    body {
                background-color: #ffffff !important;
            }
                    body.login div#login h1 a {
                background-image: url('http://digitalcinemafilms.co.uk/wordpress/wp-content/uploads/2014/02/logo-login.png');
                max-height: 67px;
                max-width: 326px;
                width: auto;
                overflow: hidden;
            }
                    .login #backtoblog a {
                text-shadow: none;
            }
            .login #nav a {
                text-shadow: none;
            }

thank you in advance

https://wordpress.org/plugins/webriti-custom-login-page/