Change Sales badge

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I've searched my question before but did not found exactly what I'm looking for.

I want to change my sales badge on the Brooklyn theme from the standard. How do I want it?

1. Top right corner

2. Rectangle with a black background and white text 

3. Percentage is stead of discount price

I tried using a code I found on the community but the rectangle was kind of weird. I need it to be really basic and simple

Who can help me? 

Big thanks in advance!