How to change the background inside the banner slideshow Opencart?

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For example, the background of the arrow to do not white and black.
March 23rd 20 at 19:44
1 answer
March 23rd 20 at 19:46
Solution
Background there is a picture, that was not the white boxes, you need to upload images in png format, yet have the answers here https://opencartforum.com/topic/19493-adaptivnyy-r...

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