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p.even, p.odd {
    margin: 0;
...
p.odd {
    background-color: #ccc;
}

<p class="even">#!/usr/bin/perl</p>
<p class="odd">use&#160;strict;</p>
...
<p class="odd">&#160;&#160;&#160;&#160;$|&#160;=&#160;1;</p>
<p class="even">}</p>
...