Remove vertical scrollbar in syntaxhighlighter

An annoying bug in the new version of SyntaxHighlighter 3 shows vertical scrollbar on every code snippet.

To fix this, change the code under syntaxhighlighter/syntaxhighlighter3/styles/shCore.css and replace overflow: auto !important; with the code below:

.syntaxhighlighter 
{...
  overflow-x: auto !important;
  overflow-y: hidden !important;
...
}

to:

.syntaxhighlighter {
  ...
  overflow: hidden !important;
  ...
}