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

/* above is standard with bookdown-demo */

/* ineffective */
p normal  { 
  color: #123edf; 
  
}