select2/docs/_sass/_code.scss

// Code (inline and block)

// Inline code within headings retain the heading's background-color
h2 code,
h3 code,
h4 code {
  background-color: inherit;
}

// Modify Bootstrap's styles for blocks of code
pre.prettyprint {
  padding: 9px 14px;
  margin-bottom: 14px;
  background-color: #f7f7f9;
  border: 1px solid #e1e1e8;
}