Is there any way to decorate the styles of the created directory list web server?

From time to time, we need to show the contents of the web server directory (mainly IIS, sometimes Apache). The problem is that it looks ugly (maybe).

Of course, we could use a .NET (or php) script that reproduces the functionality.

But is there a direct way to influence the appearance of the listing or to somehow modify the stylesheet? Can I add a CSS file?