Darken the arrows below the magnified image

Here’s a screen shot from the bottom of a product page, magnified image, in Shopify. Please zoom in the image. Notice that the < X > is very faint. Sometimes on some pages, they’re almost invisible. Can you help darken them or somehow make them more visible? It doesn’t need to be dramatic, but just so that they are more obvious.

https://reflectperfection.com/collections/vanity-mirrors/products/kimball-young-mirror-image-3x-stylish-cava-makeup-mirror