Online, above the fold, is the content that displays on a site without requiring the visitor to scroll. Once again, the idea is that this content gets the most attention. The best practice states that your call to action must be above the fold because visitors do not typically scroll beyond the fold. Call to action color needs to stand out the most on the page. There are numerous experiments and opinions, and normally CTAs tend to be red and sometimes green, blue or orange. They are usually the most eye-catching colors, but the whole context is equally substantial.
