Hi,
You can adjust them. However, the same CSS will be used for all the rows there.
So you won't be able to make one bigger than another.
To do that, you need to add an extra parameter in the preload where each row's data is being generated, and then you can add a class parameter to the td tags in the HTML version for that extra parameter so that you can then add CSS code on that class in style tags.
So it's possible with a bit of tinkering.
In fact, it's a good idea. We'll look at doing that on our end for the next version of HikaShop. That way, you'll just have to add the CSS based on the class of the elements. It will be way easier.