Your post purchase branding will directly match your Shopify checkout branding. This means that there's no settings within AfterSell to edit colours, fonts, etc. However, you can edit these in your Shopify checkout editor.

To get to the Shopify checkout editor, follow the steps in the gif below:

Many of the fields in this checkout editor are mapped to AfterSell's post purchase page. The below image represents the mapping. Numbers marked on the Shopify checkout settings have corresponding numbers on the one click upsell image.

For example, the button colour on Shopify checkout maps directly to the post purchase page button colour.