How can I make the who we are section to be reduced

Hi,
How can I make the who we are section to be reduced in width and centered in the middle? I used this snippet (from my other site: http://deefrentng.com/nebulous) but didnt reflect: /* about-us-crammed */
section#about-brooklyn {
margin: 0 auto;
width: 70%;
}
How can you aid me solve this?

Url: http://deefrentng.com/afrealsite

Regards