Buttons are not the foundations of the design system but are an important part of UI there are many variations of a button component and we try to keep things simple. note: Google Material Icons align when fix applied from the icons page.
Making a button consists of one of the following a Link Block, Link or Button we first give a class of button, then from there we can stake classes to define the style. for the border color we simply say which color then border like so primary-border