This is the template that is used for cloning. It has parts on it that might not be used but they’re there to show how the site could appear.
The colour is set from https://alphagov.github.io/design/gov.uk.colours/. It should not be changed from this palette. This is to try to give Solgrid a consistent feel.
Headings and fonts are all set from the styles. There is a simple MS Word template that helps people use the correct styles. Again, this is to try to ensure that the site is coherent and pleasing for the end-user.