I'm doing my first responsive design using "div's" instead of table but can't figure out how to center the web page on the screen. Can anyone help?

Here is the site in progress:
http://marketyouredge.com/Berta2014/index.php


Thanks,

In your: stylesheets/default.css try changing this:

body {
width: 100%;
max-width: 960px;
margin-left:10px;
position: relative;
border: none;
}

to this:

body {
width: 100%;
max-width: 960px;
margin: 0 auto;
}