The overlay dimensions are 1280 x 720 px (width x height)
Each "window" is 630 x 340 px (width x height)
The "windows" are aligned in the centre vertically and left or right horizontally. This creates a 190px margin from the top and bottom and a 20px gap between them.
You can make the windows even smaller but I wouldn't recommend making them larger as you may end up with some black lines on the top and bottom.
Only PNG images are supported for now
Once you have your branded overlay, you can upload it to the BlinderStudio by following this simple guide.

