When editing a palette, you will see some lines like this:

/*
This is the font color for the blog post
*/

or like this...

/* This is the font color for the blog post */

These are "comment" lines which are there to help you know which items you can change and what they do.

Everything between /* and */ is a comment and does not affect your blog.

You can even add your own comments if you like. This will help you keep track of what you changed. Also, if you want to try something out, you can duplicate a line and make a change. For example, if there is a line to change a color like:

background-color: WHITE;

and you want to try out changing it to black, but don't want to forget how to set it to white, you can do this:

/*
background-color: WHITE;
*/
background-color: BLACK;

The first line changing the background to white will not work, since it is treated as a comment. If you decide you don't like the black, you can remove that line and remove the comments.