Long code problem

 -----------    <pre>     

Repairing is very simple:

pre {
white-space: pre-wrap ; /* Opera, Firefox, Safari, Chrome*/
white-space: -o-pre-wrap ; /* Opera (8?) */
word-wrap: break-word ; /* IE 5.5+ */
}

And in the meantime, the bug with wide pictures has been fixed in Habr's CSS. Now there is no need for UserCSS.
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Updated: Bug fixed. Glad to see that my comments are not in vain.