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<p class="code"></p><div class="codeblock"><tt class="codetext">my $me
+ssage="Hello world\n";<br>
print $message;<br>
</tt></div> <!-- </p> should be here, not before opening <div> -->

p.code { display: none }
div.codeblock {
    display: block;
...
    color: #069;
    padding: 1em;
}