Responsive image adds black space left and right

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Posted: 2/24/2019
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Good day all.

I'm building a sit for a client and when it's in responsive mode the logo at the top adds a bunch of black space on the left and right that is not in the original image. I noticed once I upload it into Artisteer it will add and then save the image with the black bars. How do I prevent this from happening?

Thank you!