@font-face {
  font-family: 'Intro Rust Base';
  src: url('/fonts/introrust-base.woff2') format('woff2'),
       url('/fonts/introrust-base.woff') format('woff'),
       url('/fonts/introrust-base.otf') format('opentype');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

/* Usage example */
.intro-rust {
  font-family: 'Intro Rust Base', sans-serif;
  font-weight: 400;
  font-style: normal;
}