Inline code blocks: too little contrast, too much padding

In the book, the CSS styles for inline code blocks have a couple problems:

* The background color of the inline code block is nearly indistinguishable from the page background.
* The left and right padding are large enough that when followed by punctuation such as a comma, it looks like there's an extra space.

Locate the CSS styles for inline code blocks in the book source and compare them with the supplied screenshot. Adjust the background contrast and horizontal padding so inline code is distinct without creating an apparent gap before punctuation; verify the affected book content visually.

Written by the indexing model from the issue text.