Remove white border lines above and below slider

How can I change this color from white to match my black background?

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Hello Roger,

To remove border below slider

Paste this code in Custom CSS
Appearance > Theme Option > Styling Option > Custom CSS

Code:

.content_wrapper .content {
border-top: solid 1px YOUR COLOR VALUE;
}

There is no border at the top of slider.

Thanks & Regards
Nitesh Raghuwanshi