Hi Tania,
I took a quick look and you appear to have your body broken into 3 main divs. The 2nd main div has no id and has "align='center'". That doesn't really work on divs.
You need to give this second div an id like you have with "masthead" and "container". Assuming you give the nav links div an id of "navbar" then in your CSS, start with something like this:
Code:
#navbar {
margin: 0 auto;
}
Obviously add whatever else you need to style that div. The margin command sets top and bottom margin to 0 pixels and left and right margin to an equal amount of the space left over. That should center the navbar div. You can add font sizes to it to make sure you get the right font size.
Good Luck