This template contains styles for the black header bar, the footer and core layout classes. By default it will center your content to the same width as the GOV.UK header. It provides classes for grid layouts using the column mixins from the frontend toolkit.
It is recommended that new applications use this template so they behave in a consistent way.
This template only contains styles for the black header bar and the footer of GOV.UK.
Use this layout if you want to explicitly control the full layout of your page including centering all the content.
This template historically contained all the styles for GOV.UK.
You should not use this template