Heres my method
fitting a square in a rectangle : grab 1px of the left edge and extend it to the rectangle as needed, same for the right side then blur the edges good and add a gradient.I used this technique in my new signature.
What it really looked like
fitting a square in a rectangle : grab 1px of the left edge and extend it to the rectangle as needed, same for the right side then blur the edges good and add a gradient.I used this technique in my new signature.
What it really looked like