If you are a beginner or just starting, do not change the positioning, size, layout, etc properties if you don't know what you are doing. Feel free to play around with a duplicate copy of the theme.
I used a grayscale for the full template. But I added an extra style for color as "Brand color". If you change that, only the primary button color (refer: to the CMS detail page) will change.
No code components or overrides is used anywhere in the template.