There is no way to make the scroll bar on top of your content without using shadow hacks, and this is not a good idea, as this will affect the usability of your application. If the scroll bar is above the content, it can hide links / text, etc.
Your page should ideally be designed in such a way that it adapts to different browser / page widths without breaking. Especially with a small scrollbar.
In any case, a workaround that might help:
html {
overflow-y: scroll;
}
Adding this style ensures that the scroll bar track is always present, and also helps to avoid “leading” pages when the scroll bar appears / disappears. Again, the real solution is to use a flexible layout.
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