Well, suppose you have your matrix layout control with id "layout".
You can add in your, say, style.css the following property:
#layout { overflow: auto;
}If you know for sure which axis the scrolling would use, you may use property overflow-x or overflow-y.
The overflow property's value "auto" means that the scrolling will appear only if there is a need for it.
For more details: http://www.w3schools.com/cssref/pr_pos_overflow.asp
Yuri