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rbookdown

underline chapter title number (only) in bookdown when split_by not used

How to add the 3px line under the number of Chapter title as in: https://bookdown.org/yihui/bookdown/introduction.html without underlining also the sections (1.1). Problem occurs when split_by: section is not used in _output.yml. (I do not want to split by sections)

#_output.yml
bookdown::gitbook:
  css: style.css
  split_by: section #<- NOT HAVING THIS

#css
.level1 .header-section-number {
  display: inline-block;
  border-bottom: 3px solid;
}
Solution

  • I manage to do that with:

    .level1 .header-section-number {
  display: inline-block;
  border-bottom: 3px solid;
}

.level2 .header-section-number {
  border-bottom: none;
}