Simple Client Text Editor

I have a client who wants to add a little news section and would like to add news every week. Basically he just needs to type text, no pictures, media or tags...just text. And it needs to display on the site in a little dynamic CSS section.

So my question is, is there any open source software out there that will accomplish this? I could see using PHP/MYSQL but for such a small request I was hoping not to have to spend all the time creating the front and back end.

Many, many thanks in advance!