Not clear on what was in this link. Looked like a lot of code. I tried to fix the issue by changing the word "white" in the code you provided above to "black" hoping it would change the color of the arrows, but it didn't work. The arrows remain thin and black, which doesn't show up against the dark background of my photos. I included a photo of what this looks like on my squarespace site. Any help is much appreciated with altering the code (to produce white arrows instead of black). Thanks again!!