Based upon the helpful links provided by @ilias, and based upon the helpful comment by @Arjun Chaudhary, the following code resolves the issue:
<style type="text/css">
.syntaxhighlighter {
width: 500px;
height: 500px;
overflow-y: auto !important;
overflow-x: auto !important;}
</style>
<pre class="brush: lisp">
INSERT-CODE-SNIPPET-HERE
</pre>
OR, modify shCore.css
of syntaxhighlighter
(aka wp-syntaxhighlighter
):
.syntaxhighlighter {
width: 500px;
height: 500px;
overflow-y: auto !important;
overflow-x: auto !important;
margin: 1em 0 1em 0 !important;
position: relative !important;
font-size: 1em !important;
}
(source: lawlist.com)