SyntaxHighlighter Vertical Scrollbar

SyntaxHighlighter 3.0.83 seems have annoying issue, there is always a vertical scrollbar which you can only scroll a little. I found a solution here http://xbfish.com/2011/04/26/remove-vertical-scrollbar-in-syntaxhighlighter/, but it doesn't work.

After several tries, I found that commenting line-height in shCore.css works

.syntaxhighlighter a,
.syntaxhighlighter div,
.syntaxhighlighter code,
.syntaxhighlighter table,
.syntaxhighlighter table td,
.syntaxhighlighter table tr,
.syntaxhighlighter table tbody,
.syntaxhighlighter table thead,
.syntaxhighlighter table caption,
.syntaxhighlighter textarea {
 -moz-border-radius: 0 0 0 0 !important;
 -webkit-border-radius: 0 0 0 0 !important;
 background: none !important;
 border: 0 !important;
 bottom: auto !important;
 float: none !important;
 height: auto !important;
 left: auto !important;
//  line-height: 1.5em !important;