Using generic font-family to have consistency across operative systems http://www.w3.org/TR/CSS2/fonts.html#generic-font-families

styles.css

pre {
 font-family: monospace;
 white-space: pre-wrap;       /* css-3 */
 white-space: -moz-pre-wrap;  /* Mozilla */
 white-space: -pre-wrap;      /* Opera 4-6 */
 white-space: -o-pre-wrap;    /* Opera 7 */
 word-wrap: break-word;       /* Internet Explorer 5.5+ */
 /*
 padding: XX;
 margin: XX;
 background: #xxxxxx;
 
other fancy stuffs
 */
}