pre {
	white-space: pre;           /* CSS 2.0 */
	white-space: pre-wrap;      /* CSS 2.1 */
	white-space: pre-line;      /* CSS 3.0 */
	white-space: -pre-wrap;     /* Opera 4-6 */
	white-space: -o-pre-wrap;   /* Opera 7 */
	white-space: -moz-pre-wrap; /* Mozilla */
	white-space: -hp-pre-wrap;  /* HP Printers */
	word-wrap: break-word;      /* IE 5+ */
	}

http://perishablepress.com/press/2010/06/01/wrapping-content/

To wrap long URLs, strings of text, and other content, just apply this carefully crafted chunk of CSS code to any block-level element (e.g., perfect for <pre> tags):

Wrap long URLs and text with CSS

CSS