Prettifying preformatted text

If you have many blog posts that contain the preformatted text you can add the following code in Custom CSS. You get the same aspect as the code below.

{
  border-style: dotted; 
  border-width: 2px; 
  border-color: #aaaaaa;
  background-color: #f2f2f2;
  padding: 10px;
  font-family: 'Roboto Mono', monospace;
  font-size: 15px;
  word-break: break-word;
  white-space: pre-wrap;
}