In Responsive view, preview section taking on half of screen width

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In Responsive view, preview section taking on half of screen width which does not looks proper

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I have attached Screenshot for better Understanding

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Page Url - https://meta.trac.wordpress.org/prefs/pygments

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After applying folllowing Changes to css issue is resolved.
https://meta.trac.wordpress.org/prefs/pygments

div.code pre {
    border: 1px solid #999;
    font-size: 90%;
    margin: 1em 2em;
    padding: 5px;
 -  width:60%;
 +  max-width: 100%;
}