Color to use for 'Save draft' button?

1. What color should my buttons be?
2. What color button are people more likely to click on?

What color should my buttons be?

Plenty of people will tell you that red is the best color because it conveys urgency and evokes excitement, or that green works best because “green means go”. Meanwhile, Unbounce suggests that a BOB (big orange button) is ideal because orange “represents energy, enthusiasm, and a 'get-it-done' attitude.”

What color button are people more likely to click on?

According to the study, the red-colored CTA button performed better than the green-colored one (21% more people clicked on the red CTA button than on the green button).