Foundry 3: Icon size in forms

How can I reduce the icon size in Foundry3 forms?
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Is it a page with a CMS Core stack from Total CMS on it ? because I have the same problem on one of my pages.

Yes! I use on this page this stack in order to connect information to cms.

I am not sure, but I suspect the Total CMS css to change the height of the input and the font-size. That could be why there is a difference between icon size and input.
But as I didn’t find how to solve this problem, I have chosen “floating” as the label type.
Perhaps, somebody here, can give us a solution ?