How to Center an entire page on Wells with CSS?

Site URL: http://matthewparentcreative.com/cinematography

Hi there! 

Trying to figure out how I could make the content of each page centered in whatever window a viewer sees on a laptop. Everything is shifted left and it's killing me. Thanks! 

Try adding to Design > Custom CSS

div#canvasWrapper {
    max-width: 100%;
}