"floatingPreferencesButton" (Bug + Feature Request)

Hi! 

In order to fully customize the floatingPreferencesButton, there should be an additional id attribute.

Because of excessive use of !important styles in the most specific selector

.iubenda-tp-btn:not([data-tp-nostyle])

it is impossible to override the button's styles with custom CSS .

It is even breaking the documented option

_iub.csConfiguration = {
...
floatingPreferencesButtonRound: false,
...
}