Set your project to use a different Theme (Change Theme)

I was told during the demo we could create themes that can be applied to projects, but I can only see pre-made themes. Where can I create a theme for my company to use? 
 

I would like my heading (H1) to be a different color than the normal text on the page, but still auto-change based on the background. 
In the Theme Designer, I can go under Colors -> Page and modify the foreground, but this changes both the heading text and the body text. 
I have also tried adding css (example css below) to change the color of H1. This works, but it is stuck this color. In other words it doesn't change based on the background anymore and also I can't choose another option und...

Administrators can create new custom Themes from any of the default Player Experiences.

The custom theme can easily reflect any organization's branding, such as look and feel.

The theme determines the functionality and design of your project. Only administrators have permission to create new themes. If you need to create a new theme, but do not have permission to do so, contact your administrator. Alternatively, if the changes you require are purely design related, you can create a new variant of an existing theme. Variants maintain all the theme's original functionality while allowing authors to choose their own colors and fonts. See the article Create a Variant f...

The ILT theme is built using the Instructor Led Training player experience which optimizes your Claro project into a projector-friendly format. This theme is ideal for live classroom instruction which can be enhanced with handouts and web resources.

The Tutorial theme is ideal for delivering small topic-driven forms of content.

The Nova theme uses traditional eLearning presentation.

Theme colors are available to style elements throughout your projects as you see fit.

The Presentation theme uses traditional eLearning presentation and is built using the Course Player experience.

I have three courses where I am trying to apply the same theme to all three. 
 
In two of my courses, I have four themes listed, which is perfect. I can select the theme I want. 
 
In the third course, only one theme is listed, and it's not the theme I want. How do I get the theme that is applied to courses A and B to also apply to C? All three courses are Flow courses.