Is it possible to add a old style coloured border on a window

Much as I like the new windows 10, I find if I have a few windows open and overlapped then it's far to easy to close the wrong window. And the reason is that the whole washed out white and no window borders mean one window looks like it's another window when overlapped.

What would be great is if I could get a blue (or whatever) border back on the window so that it'a much easier to see which window is which. Is it possible without any third party stuff?

Very retro, they aint pretty, kind of windows 3.0 kind of feel.

How hard can it be to leave a win7 or xp look theme in there for those that don't like the new looks.

Use the Aerolite theme to have the menu bar colored. Then use the Aero Glass to get transparency and 3D look of the buttons. Only disadvantage is the watermark bottom right that goes away if you donate. This is a sample when you install Aero Glass:



Far better than the flat and all-black outline of the original... You can also tweak the size of the menu bar, the scroll bar and all the system fonts using Winaero Tweaker. You can even extract all icons from Windows 7 or 8.1 system files and then replace the flat ugly Windows 10 icons at the respective system files using Customizer God.

Aerolite and AeroGlass works pretty nice.