Give the CTA a contrasting color

When to use it

When the primary button shares its hue with the site palette and blends into the page.

How to run it

Recolor the primary CTA in a hue used nowhere else on the page, with maximum contrast against everything around it.

Why it works

Point every eye at the one action

The color that wins is the one that stands out, not a magic hue. Performable (HubSpot) measured 21% more clicks for a red button over green on a green-heavy page.

Source: Performable red/green test; Bing $80M blue