How can I make these buttons obviously clickable?

1. How do you make a clickable obvious button?
2. How do you indicate clickability?

How do you make a clickable obvious button?

Apply clear visual cues to links.

Make it clear that links are clickable—avoid making users mouse over text to see if it's clickable. For example, make links blue or another color that stands out from the body text.

How do you indicate clickability?

Summary: Whether you adopt a flat-design style or not, interactive components must retain sufficient cues to suggest clickability. Signaling clickability with cues such as borders, color, size, consistency, placement, and adherence to web standards can give interactive components the proper look.