style.css

@import url('https://fonts.googleapis.com/css?family=Nunito+Sans|Proza+Libre:500,500i|Source+Code+Pro&display=swap');

p.caption {
  color: #777;
  margin-top: 10px;
}
p code {
  white-space: inherit;
}
pre {
  word-break: normal;
  word-wrap: normal;
}
pre code {
  white-space: inherit;
}

.rmdcaution, .rmdimportant, .rmdnote, .rmdinfo, .rmdwarning {
  padding: 1em 1em 1em 4em;
  margin-bottom: 10px;
  background: #f5f5f5 5px center/3em no-repeat;
}
/*.rmdcaution {*/
  /*background-image: url("../images/caution.png");*/
/*}*/
/*.rmdimportant {*/
  /*background-image: url("../images/important.png");*/
/*}*/
/*.rmdnote {*/
  /*background-image: url("../images/note.png");*/
/*}*/

.rmdinfo {
  background-image: url("images/info.png");
}

.rmdwarning {
  background-image: url("images/warning.png");
}

/* These two rules make the horizontal line go straight across in top navbar */

.summary > li:first-child {
	height: 50px;
	padding-top: 10px;
	border-bottom: 1px solid rgba(0,0,0,.07);
}

.book .book-summary ul.summary li.divider {
	height: 0px;
}

/* Hide first level-one markdown header from only the chapter named
what-they-forgot-to-teach-you-about-r */

#what-they-forgot-to-teach-you-about-r > h1:nth-child(1){
  visibility: hidden;
}

/*------------- Body and header text---------------- */

.book.font-family-1 {
  font-family: 'Nunito Sans', sans-serif;
}

.title, h1, h2, h3, h4 {
  font-family: 'Proza Libre', sans-serif;
  color: #284a29;
}

.author {
  color: #284a29 !important;
}

p.author em {
  font-style: normal !important;
}

/*------------ TOC --------------*/

.summary {
  font-family: 'Nunito Sans', sans-serif;
}

.book .book-summary ul.summary li a,
.book .book-summary ul.summary li span {
  color: #284a29;
}

.summary a:hover {
  color: #629d62 !important;
}

.book .book-summary ul.summary li.active>a { /*active TOC links*/
  color: #629d62 !important;
}

/*-----Body Links-------*/

.book .book-body .page-wrapper .page-inner section.normal a {
  color: #629d62;
}

.book .book-body .page-wrapper .page-inner section.normal a:hover {
 color: #284a29; /* darker color when hovering */
}

/*------------- CODE --------------*/

.book .book-body .page-wrapper .page-inner section.normal code,
.book .book-body .page-wrapper .page-inner section.normal pre {
  font-family: 'Source Code Pro', monospace;
}