demo/Rmd/style.css

@import url('//code.cdn.mozilla.net/fonts/fira.css');
@import url('//korap.ids-mannheim.de/font/libertinus.css');

h1, h2, h3, h4, h5, h6 {
    font-family: 'Fira Sans',sans-serif;
    line-height: 1.2;
    font-weight: 500;
}

.title, .subtitle {
  text-transform: uppercase;
  text-align: center;
}

.date, .author {
  text-align: center;
}

body {
    font-family: 'Fira Sans', sans-serif;
    font-size: 18px;
    font-weight: 400;
    font-variant-ligatures: common-ligatures;
    font-variant-numeric: tabular-nums;
}

th {
  color: rgb(246, 168, 0);
}

p {
  hyphens: auto;
	text-align: justify;
  overflow-wrap: break-word;
}

.footnotes {
  font-family: 'Fira Sans Condensed', sans-serif;
  font-weight: 400;
  font-size: 14px;
  line-height: 1.5;
}

#TOC > ul {
  font-family: 'Fira Sans', sans-serif;
}

.caption {
  font-family: 'Fira Sans Condensed', sans-serif;
  font-weight: 400;
  font-size: 16px;
	text-align: center;
}