Please, can you send the link to this page so I can take a look? You can use the Set as private reply checkbox below if you want to keep your site private.
Thanks for sharing. If you don’t have a Custom CSS plugin installed, please, go to Plugins > Add New and add search for Simple Custom CSS. Install, activate and go to Appearance > Custom CSS and insert:
/* Body */
body {
background: #fff;
}
I’m using OS X and your site looks full-width in both Chrome and Safari. I also checked Firefox, it seems normal there too.