Added the white-space property with a value: pre.

Lisppaste uses pre-wrap, but it's not so good (wrapping in the middle of a hyphenated symbol or Python).
The link: http://paste.lisp.org/lisppaste.css
Styled a nonparen class.

css/colorize.css

@@ -9,18 +9,21 @@ a.symbol:hover { color : #229955; background-color : transparent; text-decoratio
 .string { color : #777777; background-color : inherit; }
 .character { color : #0055AA; background-color : inherit; }
 .syntaxerror { color : #FF0000; background-color : inherit; }
-/* span.paren1:hover { color : inherit; background-color : #BAFFFF; } */
-/* span.paren2:hover { color : inherit; background-color : #FFCACA; } */
-/* span.paren3:hover { color : inherit; background-color : #FFFFBA; } */
-/* span.paren4:hover { color : inherit; background-color : #CACAFF; } */
-/* span.paren5:hover { color : inherit; background-color : #CAFFCA; } */
-/* span.paren6:hover { color : inherit; background-color : #FFBAFF; } */
+span.paren1:hover { color : inherit; background-color : #BAFFFF; }
+span.paren2:hover { color : inherit; background-color : #FFCACA; }
+span.paren3:hover { color : inherit; background-color : #FFFFBA; }
+span.paren4:hover { color : inherit; background-color : #CACAFF; }
+span.paren5:hover { color : inherit; background-color : #CAFFCA; }
+span.paren6:hover { color : inherit; background-color : #FFBAFF; }
 
+pre, .code, span.nonparen {
+    background-color: #f7fbfd;
+}
 
 pre, .code {
-    background-color: #f7fbfd;
     border-top: 1px solid #AC9; border-bottom: 1px solid #AC9;
     margin: 0.2em; padding: 0.5em;
     font-family: "Courier New", monospace; font-size: 90%;
     overflow: auto;
+    white-space: pre;
 }