I made some minor changes to the default stylesheet to have blocks of code no longer overflow the edge of the page.
Changes were based on the stylesheet I found at
http://www.bigbold.com/snippets/stylesheets/posts.css.
I added in the following:
pre {
border: 1px solid #333;
padding: 6px;
overflow: auto;
margin: 0px 1%;
width: 95%;
}
Thanks to the Snippets public code repository.
Changes and suggestions welcome!