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Make this two objects with the Rounded Rectangle Tool.
Click on 'Add to shape area'. After that click on Expand.
Fill it with Gradient and set Stroke on '11 pt'.

Copy the object and paste it. Make something like in the picture
with the Pen Tool on the pasted object,
Select both objects and click on Divide. Select the bottom part
with the Direct Selection Tool and delete it.
Go to Object > Path > Offset Path. Delete the outside
part.
Place it on the original object and give it a black/white gradient.
Set it on Screen.

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