Buttons in The Universal Theme are implemented as links.
{% button "Click me" "https://google.com" "pink" %}
{% button "Click me" "https://the-universal-theme.netlify.app" "yellow" %}
{% button "Click me" "#" "blue" %}
The first parameter is button's text, the second is a link, and the third parameter is a link color. There're three button colors:
Note that buttons may be used right inside a paragraph of text, like This