Scaling Issues with Cubic Responsive Theme

The following code causes the entire page on my cubic themed website to be a width 320 and since the css for cubic left aligns the site it is really visually unappealing at these widths.

pearl_csv_to_webpage_css.css :

/* Smartphones (portrait and landscape) ----------- */
	@media only screen
	and (min-device-width : 320px)
	and (max-device-width : 480px) {
		body { 
			padding: 0; 
			margin: 0; 
			width: 320px; }
		}

Is there a particular reason you went with setting the body at a static width for this?