how to remove unnecessary scrollbar from syntaxhighlighter code

I've been looking for how to remove annoying scroll bar in syntaxhighlighted code. They were visible in Chrome but not in FF. I came across the solution here. Just add following code snipped at the end of < head > section.

<style type="text/css">
.syntaxhighlighter { overflow-y: hidden !important; }
</style>