Not really sure what you mean by adding colors.
You can use the item class you added to the divs. I would suggest you avoid inline styles and use classes instead which you can add as you did inside the template strings.
I’ve edited your code for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.
You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.
See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (').