user-guide/gitbook/gitbook-plugin-search/search.css

/*
    This CSS only styled the search results section, not the search input
    It defines the basic interraction to hide content when displaying results, etc
*/
#book-search-results .search-results {
  display: none;
}
#book-search-results .search-results ul.search-results-list {
  list-style-type: none;
  padding-left: 0;
}
#book-search-results .search-results ul.search-results-list li {
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  /* Highlight results */
}
#book-search-results .search-results ul.search-results-list li p em {
  background-color: rgba(255, 220, 0, 0.4);
  font-style: normal;
}
#book-search-results .search-results .no-results {
  display: none;
}
#book-search-results.open .search-results {
  display: block;
}
#book-search-results.open .search-noresults {
  display: none;
}
#book-search-results.no-results .search-results .has-results {
  display: none;
}
#book-search-results.no-results .search-results .no-results {
  display: block;
}