Changing your Site Color Theme
By default, when your site is first created, we typically will pull colors from your existing logo and use that color theme throughout your site. If you ever wanted to change this color that is showing, you would just want to do the following.
First, you would want to start out by navigating to your Admin module -->Setup-->Getting Started-->Profile page.
Once you are inside of the Profile page, you would want to look for the Main Color setting. If you click on that Main Color textbox, a color box should now be showing. From this color box, you can pick a new color of your choice.
Once you are finished making your changes, you will want to click Save in order to update your changes. Now, you should be able to immediately notice the color change throughout your site. This change will also effect the colors showing on the client registration portal as well.