Make a raw_id_fields input textbox wider

*****SORRY**** My previous message was incomplete *******
I'm trying to make the input textbox of a raw_id_fields wider than the default size but without success.
Here is what I tried ('codarticolo' is the raw_id_fields):

admin.py
.............
class MovimentomagInline(admin.TabularInline):
formfield_overrides = {
models.CharField: {'widget': TextInput(attrs={'size':'30'})},
models.TextField: {'widget': Textarea(attrs={'rows':4, 'cols':40})},
}
widgets = {
'codarticolo': SelectMultiple(attrs={'size': 30})
}

# list_display = ('codarticolo', 'numconfezioni', 'numerounita','totalepezzi')
raw_id_fields = ['codarticolo',]
fields = ('codarticolo', 'numconfezioni', 'numerounita','totalepezzi')
model=Movimentomag
extra=3

What should I do?
Ciao
Vittorio

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