According to Fitts's law, acquire a target (aka hitting CTA) is a function of the distance (place it at the correct point during the user flow) to and size of the target (make it big & prominent enough).
β οΈ Disclaimer:
You can build a decent business with the exact same button. But if you want to WOW your users, follow the next tips to make your CTA stand out...
1. Add Padding
Saying it again (without feeling any guilt):
"Whitespace is your best design pal."
π‘Rule of thumb:
Set the horizontal padding equal to x2 the vertical one.
You can always use other formulas but that's a quick way to make it look visually nice.