The Steam overlay is positioned in the browser window, even when the toolbar is enabled. It is also set to be the same size as the entire display, meaning the bottom of the overlay extends off the bottom of the screen. However, it still thinks its positioned starting at the top left of the screen, which means the visible mouse cursor does not line up with where Steam thinks you’re clicking on the overlay.
For me, the Steam overlay is badly positioned. i have to move my mouse more left to close a steam message
Apologizes guys… but in this case I guess we need to blame Steam for this 
Unfortunately when using the toolbar, Steam overlay’s alignment / positioning is (in contrast to what you see) shifted by the amount of the height of the toolbar.
There is (afaik) no way to influence it.
The reason is that Steam thinks that the renderable window is the whole window (incl. the toolbar) while it renders for real only where it is allowed to render (in the client area). So it renders in a smaller area while using the original size.
(Hope it’s explained somehow clear).
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