<p>The background image colors don't appear to match the CSS background colors on Windows:</p>

<p><img src="https://i.stack.imgur.com/rn4sZ.png" alt="alt text"></p>

<p>Might <a href="http://www.viget.com/inspire/the-mysterious-save-for-web-color-shift/" rel="nofollow noreferrer">this</a> have something to do with it?</p>
