Change Theme Button Color, Styling & Typography
Global Button Color & Border Radius
To change your button color site-wide simply log into WordPress and go to Appearance > Customize > General Theme Options > Links & Buttons to make your adjustments.
Global Button Typography Options
If you want to change the font family, weight, style, transform, line-height and letter spacing of all the buttons on the site you can do this in the Customizer under the Typography > Buttons section.