hugo-book-theme/assets/_fonts.scss

/* roboto-regular - latin */
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: local(''),
       url('fonts/roboto-v27-latin-regular.woff2') format('woff2'), /* Chrome 26+, Opera 23+, Firefox 39+ */
       url('fonts/roboto-v27-latin-regular.woff') format('woff'); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
}
/* roboto-700 - latin */
@font-face {
  font-family: 'Roboto';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: local(''),
       url('fonts/roboto-v27-latin-700.woff2') format('woff2'), /* Chrome 26+, Opera 23+, Firefox 39+ */
       url('fonts/roboto-v27-latin-700.woff') format('woff'); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
}

/* roboto-mono-regular - latin */
@font-face {
  font-family: 'Roboto Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: local(''),
       url('fonts/roboto-mono-v13-latin-regular.woff2') format('woff2'), /* Chrome 26+, Opera 23+, Firefox 39+ */
       url('fonts/roboto-mono-v13-latin-regular.woff') format('woff'); /* Chrome 6+, Firefox 3.6+, IE 9+, Safari 5.1+ */
}

body {
  font-family: 'Roboto', sans-serif;
}

code {
  font-family: 'Roboto Mono', monospace;
}