Two things - firstly not all browsers read vertical centreing, can't remember which one it is (Safari?) but one will mess your page up with vertical centreing. Horizontal is cool however.

As pointed out above you need the text-align : left in the wrapper/container and text-align : center for the body. You'll need a wrapper div to act as a container something like below -

/*wrapper centres page*/
#wrapper {
margin : 3px auto 0 auto;
padding : 0 0 0 0;
width : 876px;
height : 570px;
background-color : #cccccc;
text-align : left;
}

Here's a good link

http://www.bluerobot.com/web/css/center1.html

Good luck

Hi Claire -

Still working to 800*600!!!! Even the BBC and my useability/accessibility obsessed tutors last year (and I mean completely obsessed) have moved to 1024*768 now...my site logs show under 0.5% of users in 800*600 - time they moved on? Or learnt to increase text size or bought glasses ;-0