The use of buttons isn’t limited to landing pages. In fact, email marketers can greatly benefit from the use of buttons.

What should my button say?

A great rule of thumb when writing a call to action is to make your button copy complete this sentence:

I want to ________________

What should my button look like?

A 3D effect
A contrasting, non-grey color
Feedback on hover (e.g., different color)
Whitespace around it
An arrow pointing to it with instructional copy https://www.copyblogger.com/call-to-action-buttons/

Button generator:
http://buttonoptimizer.com/