How do you copy specific colors from a user-created syntax theme?

I like this theme’s blue background but not the syntax colors. Therefore, I’m trying to just take the css styles from this theme that will make my editor all blue.

What I Did

From the repository, I copied the css from the files: colors.less, editor.less, syntax-variables.less and pasted it into my styles.less file. Doing this changed my code area’s background to blue, but my sidebar, tabs, and footer is still grey. What css do I need to copy from the repo to make my entire editor blue?

Before copying css

After copying css (sidebar, tabs, footer still grey