datahub/wherehows-web/app/styles/base/_typography.scss

/**
 * Basic typography style
 */
body {
  color: $text-color;
  font: normal 100 150% / 1.4 $text-font-stack;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 100;
}

th {
  font-weight: normal;
}