Hi, you can view Hex values in two ways:
1. On the website, when you have selected the theme you are
interested in, hit the button with the three lines on i (the
tooltip says "Make changes to this theme..."). You can then view
the hex values.
2. If you will want hex values frequently, it could be
worthwhile to install the kuler desktop (AIR) application, where
you can copy/paste the hex values to your clipboard.
AIR runtime first: