Change link color in ScapeShot not working

Hi there I am using ScapeShot for a while. Everything is working okay. But, I just want to change the link color from the default color orange to purple. I did try a few custom CSS, but it did not work out. Secondly I tried to find the correct line in the style.css, but I couldn't find it. Does anybody know, wehere I can change the link color, or telling me what I am doing wrong? Thanks for helping me out Cheers Phil