:root {
  /* Edit this to test */
  --font-family-base: "CircularStd", "Circular", "Avenir", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

html,
body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
a,
li,
blockquote,
figcaption,
button,
input,
select,
textarea {
  font-family: var(--font-family-base);
}