If you want to prevent scrollbars from being hidden on MAC OSX Lion and always show the scrollbars on Webkit browsers (Chrome / Safari) on this version of Mac OS, you can add the following rule to your CSS to force the browser to always show the scrollbar.
::-webkit-scrollbar { -webkit-appearance: none; width: 7px; } ::-webkit-scrollbar-thumb { border-radius: 4px; background-color: rgba(0,0,0,.5); -webkit-box-shadow: 0 0 1px rgba(255,255,255,.5); }
It's webkit specific and other browsers will ignore it.
source: simurai.com/post/8083942390/force-lion-scrollbar