You can adjust the following navigation styles. Remove any line to revert it back it’s default value.

/**
* Collection Carousel
* Navigation Styles
* From Will-Myers.com
**/
[data-wm-plugin="collection-carousel"] {
  --wm-cc-arrow-background-opacity: 1;
  --wm-cc-arrow-background-color: black;
  --wm-cc-arrow-background-size: 30px;
  --wm-cc-arrow-size: 15px;
  --wm-cc-arrow-color: white;
}
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