Amazon does give you the code you want (you use <iframe>s), but it is too big for the standard page width on my site, which uses the WordPress Default 1.6 theme.
I’ve tried using a different page template for the shop by removing the right-hand navigation column, but still without success:
https://www.hamiltonprimary.org.uk/hamilton-psa-shop/
The only way I can show all the shop content is to enable scrolling in the astore configuration.
Anyone else using the default theme with a fully visible Amazon astore?