Cannot load stylesheet expressJs while trying to get error pages

I'm stuck in trying to get error pages rendered with a template in my expressJs app. While I try to write..

app.get('/*', pages.error_page);

..the app works fine but without any style! Removing that line everything comes back to normal. Here's my simple function to load error page:

exports.errore_pagina = function (req, res){
res.render('errore', {title: 'Pagina errore'});
}

The app.get is in the bottom of the page just before:

http.createServer(app).listen(app.get('port'), function(){
console.log("Express server listening on port " + app.get('port'));
});

Did anybody find the same issue? Thanks a lot! Francesco