Interact.jl widget dimensions

New to Julia
3

Thanks @Jordan_Cluts , that is useful.
How would one go about querying the size of a button though? If I use your example and do,

b = button("Stop",style=Dict(
        :color => "white",
        :backgroundColor => "red",
        :width => "200px",
        :height => "100px",
        :fontSize => "3em"
   ))

I would have thought that something along the lines of get(b[:style],"height") might work, but there is no field style.