Custom CSS encodes incorrectly

Hi,

Great plugin, but I have just noticed a bug with the Staff page CSS feature:

I have a pseudo-element with the property:
content: '\00a0';
When looking at the code in index.php it displays as:
content: "\00a0";
and therefore does not show.

If I tick the “Write to external CSS file?”, then the CSS works fine, so that’s a simple workaround, but thought you’d like to know.