add_action('admin_head', 'ozel_admin_css');

function ozel_admin_css()

{ echo '<style>

body, td, textarea, input, select { font-family: "Lucida Grande"; font-size: 12px; }

</style>';

}

function OzelAdminCss(){

$src = "URL/custom-admin-css.css";

$handle = "customAdminCss";

wp_register_script($handle, $src);

wp_enqueue_style($handle, $src, array(), false, false);

}

add_action('admin_head', 'OzelAdminCss');