mastodon/app/javascript/styles/fonts/inter.scss

@font-face {
  font-family: Inter;
  src: url('../fonts/inter/inter-variable-font-slnt-wght.woff2')
    format('woff2-variations');
  font-weight: 100 900;
  font-style: normal;
  mso-generic-font-family: swiss; /* stylelint-disable-line property-no-unknown -- Proprietary property for Outlook on Windows. */
}