Collection List grid dimensions?

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Tourist
10 0 1

Hello

I have a collection list on my main page (shop.shoestory.co.uk), but I need to have landscape shapes to the grid to house landscape pictures. At moment it is square. I  can see that the grid references "small--one-half medium-up--one-third", but  can't find how that defines a set of dimensions??? anyone know how  to   change the  grid dimensions into a 16:9 style ratio?

 

Martin

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Tourist
10 0 1

Still rattling  my brains :( !

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