Help, horizontal slide bar

I used the 2.5 joomla hotstart. If I resize the browser window, or if the user has a small resolution, there is no horizontal bar for moving in the web page. The live site is new.fcpaok.gr

Thanks in advance
Alexandros

In layout.css:

body {
margin: 0;
padding: 0;
font-family: Arial, Helvetica, sans-serif;
overflow-x: hidden;
}

remove overflow-x: hidden;