The Blockquotes and Pre-formatted text sections in the HTML for People book inspired me to improve the styling of the blog.
The following code now defines the visual appearance of blockquote and pre elements in the blog:

blockquote {
	border-left: 1px dotted #ffbb18;
	padding-left: 21px;
	margin-left: 21px;
}
pre {
	background-color: #f9f7f7;
	border-radius: 4px;
	padding: 4px;
}

To see it in effect, scroll down to the Hidden Pref to Restore Slow Motion Dock Minimizing on MacOS or Notifying external services about changes in the blog posts.